# HG changeset patch
# User Igor Sysoev <http://sysoev.ru>
# Date 1229893200 -10800
# Node ID fd759445d8a890a9db4ab645581358fdce277908
# Parent  e2c4e8b635a873c8b4ac413a953fade4de5b16b3
nginx 0.7.28

    *) Change: in memory allocation in the ngx_http_gzip_filter_module.

    *) Change: the default "gzip_buffers" directive values have been
       changed to 32 4k or 16 8k from 4 4k/8k.

diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,12 @@
 
+Changes with nginx 0.7.28                                        22 Dec 2008
+
+    *) Change: in memory allocation in the ngx_http_gzip_filter_module.
+
+    *) Change: the default "gzip_buffers" directive values have been 
+       changed to 32 4k or 16 8k from 4 4k/8k.
+
+
 Changes with nginx 0.7.27                                        15 Dec 2008
 
     *) Feature: the "try_files" directive.
diff --git a/CHANGES.ru b/CHANGES.ru
--- a/CHANGES.ru
+++ b/CHANGES.ru
@@ -1,4 +1,12 @@
 
+Изменения в nginx 0.7.28                                          22.12.2008
+
+    *) Изменение: в выделении памяти в модуле ngx_http_gzip_filter_module.
+
+    *) Изменение: значения по умолчанию для директивы gzip_values изменены 
+       с 4 4k/8k на 32 4k или 16 8k.
+
+
 Изменения в nginx 0.7.27                                          15.12.2008
 
     *) Добавление: директива try_files.
diff --git a/src/core/nginx.h b/src/core/nginx.h
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -8,7 +8,7 @@
 #define _NGINX_H_INCLUDED_
 
 
-#define NGINX_VERSION      "0.7.27"
+#define NGINX_VERSION      "0.7.28"
 #define NGINX_VER          "nginx/" NGINX_VERSION
 
 #define NGINX_VAR          "NGINX"
diff --git a/src/core/ngx_buf.c b/src/core/ngx_buf.c
--- a/src/core/ngx_buf.c
+++ b/src/core/ngx_buf.c
@@ -201,12 +201,6 @@ ngx_chain_update_chains(ngx_chain_t **fr
             break;
         }
 
-#if (NGX_HAVE_WRITE_ZEROCOPY)
-        if ((*busy)->buf->zerocopy_busy) {
-            break;
-        }
-#endif
-
         if ((*busy)->buf->tag != tag) {
             *busy = (*busy)->next;
             continue;
diff --git a/src/core/ngx_buf.h b/src/core/ngx_buf.h
--- a/src/core/ngx_buf.h
+++ b/src/core/ngx_buf.h
@@ -51,8 +51,6 @@ struct ngx_buf_s {
     unsigned         last_shadow:1;
     unsigned         temp_file:1;
 
-    unsigned         zerocopy_busy:1;
-
     /* STUB */ int   num;
 };
 
diff --git a/src/core/ngx_palloc.h b/src/core/ngx_palloc.h
--- a/src/core/ngx_palloc.h
+++ b/src/core/ngx_palloc.h
@@ -14,7 +14,6 @@
 
 /*
  * NGX_MAX_ALLOC_FROM_POOL should be (ngx_pagesize - 1), i.e. 4095 on x86.
- * On FreeBSD 5.x it allows to use the zero copy sending.
  * On Windows NT it decreases a number of locked pages in a kernel.
  */
 #define NGX_MAX_ALLOC_FROM_POOL  (ngx_pagesize - 1)
diff --git a/src/http/modules/ngx_http_charset_filter_module.c b/src/http/modules/ngx_http_charset_filter_module.c
--- a/src/http/modules/ngx_http_charset_filter_module.c
+++ b/src/http/modules/ngx_http_charset_filter_module.c
@@ -541,12 +541,6 @@ ngx_http_charset_body_filter(ngx_http_re
                 break;
             }
 
-#if (NGX_HAVE_WRITE_ZEROCOPY)
-            if (b->zerocopy_busy) {
-                break;
-            }
-#endif
-
             ctx->busy = cl->next;
 
             if (b->tag != (ngx_buf_tag_t) &ngx_http_charset_filter_module) {
diff --git a/src/http/modules/ngx_http_flv_module.c b/src/http/modules/ngx_http_flv_module.c
--- a/src/http/modules/ngx_http_flv_module.c
+++ b/src/http/modules/ngx_http_flv_module.c
@@ -60,12 +60,12 @@ ngx_module_t  ngx_http_flv_module = {
 static ngx_int_t
 ngx_http_flv_handler(ngx_http_request_t *r)
 {
-    u_char                    *p, *n, *last;
+    u_char                    *last;
     off_t                      start, len;
     size_t                     root;
     ngx_int_t                  rc;
     ngx_uint_t                 level, i;
-    ngx_str_t                  path;
+    ngx_str_t                  path, value;
     ngx_log_t                 *log;
     ngx_buf_t                 *b;
     ngx_chain_t                out[2];
@@ -167,18 +167,10 @@ ngx_http_flv_handler(ngx_http_request_t 
     i = 1;
 
     if (r->args.len) {
-        p = (u_char *) ngx_strnstr(r->args.data, "start=", r->args.len);
-
-        if (p) {
-            p += 6;
 
-            for (n = p; n < r->args.data + r->args.len; n++) {
-                if (*n == '&') {
-                    break;
-                }
-            }
+        if (ngx_http_arg(r, (u_char *) "start", 5, &value) == NGX_OK) {
 
-            start = ngx_atoof(p, n - p);
+            start = ngx_atoof(value.data, value.len);
 
             if (start == NGX_ERROR || start >= len) {
                 start = 0;
diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
--- a/src/http/modules/ngx_http_gzip_filter_module.c
+++ b/src/http/modules/ngx_http_gzip_filter_module.c
@@ -34,21 +34,27 @@ typedef struct {
     ngx_chain_t         *busy;
     ngx_chain_t         *out;
     ngx_chain_t        **last_out;
+
+    ngx_chain_t         *copied;
+    ngx_chain_t         *copy_buf;
+
     ngx_buf_t           *in_buf;
     ngx_buf_t           *out_buf;
     ngx_int_t            bufs;
 
-    off_t                length;
-
     void                *preallocated;
     char                *free_mem;
     ngx_uint_t           allocated;
 
+    int                  wbits;
+    int                  memlevel;
+
     unsigned             flush:4;
     unsigned             redo:1;
     unsigned             done:1;
     unsigned             nomem:1;
     unsigned             gzheader:1;
+    unsigned             buffering:1;
 
     size_t               zin;
     size_t               zout;
@@ -76,6 +82,10 @@ struct gztrailer {
 #endif
 
 
+static void ngx_http_gzip_filter_memory(ngx_http_request_t *r,
+    ngx_http_gzip_ctx_t *ctx);
+static ngx_int_t ngx_http_gzip_filter_copy_recycled(ngx_http_gzip_ctx_t *ctx,
+    ngx_chain_t *in);
 static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
     ngx_http_gzip_ctx_t *ctx);
 static ngx_int_t ngx_http_gzip_filter_gzheader(ngx_http_request_t *r,
@@ -92,6 +102,8 @@ static ngx_int_t ngx_http_gzip_filter_de
 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
     u_int size);
 static void ngx_http_gzip_filter_free(void *opaque, void *address);
+static void ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r,
+    ngx_http_gzip_ctx_t *ctx);
 
 static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf);
 static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
@@ -245,6 +257,9 @@ ngx_http_gzip_header_filter(ngx_http_req
     ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
 
     ctx->request = r;
+    ctx->buffering = 1;
+
+    ngx_http_gzip_filter_memory(r, ctx);
 
     h = ngx_list_push(&r->headers_out.headers);
     if (h == NULL) {
@@ -259,8 +274,6 @@ ngx_http_gzip_header_filter(ngx_http_req
 
     r->headers_out.content_encoding = h;
 
-    ctx->length = r->headers_out.content_length_n;
-
     r->main_filter_need_in_memory = 1;
 
     ngx_http_clear_content_length(r);
@@ -283,6 +296,30 @@ ngx_http_gzip_body_filter(ngx_http_reque
         return ngx_http_next_body_filter(r, in);
     }
 
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http gzip filter");
+
+    if (ctx->buffering) {
+
+        if (in) {
+	    switch (ngx_http_gzip_filter_copy_recycled(ctx, in)) {
+
+	    case NGX_OK:
+		return NGX_OK;
+
+	    case NGX_DONE:
+		in = NULL;
+		break;
+
+	    default:  /* NGX_ERROR */
+		goto failed;
+	    }
+
+        } else {
+            ctx->buffering = 0;
+        }
+    }
+
     if (ctx->preallocated == NULL) {
         if (ngx_http_gzip_filter_deflate_start(r, ctx) != NGX_OK) {
             goto failed;
@@ -356,6 +393,8 @@ ngx_http_gzip_body_filter(ngx_http_reque
         }
 
         if (ctx->out == NULL) {
+            ngx_http_gzip_filter_free_copy_buf(r, ctx);
+
             return ctx->busy ? NGX_AGAIN : NGX_OK;
         }
 
@@ -371,6 +410,8 @@ ngx_http_gzip_body_filter(ngx_http_reque
             goto failed;
         }
 
+        ngx_http_gzip_filter_free_copy_buf(r, ctx);
+
         ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
                                 (ngx_buf_tag_t) &ngx_http_gzip_filter_module);
         ctx->last_out = &ctx->out;
@@ -394,15 +435,16 @@ failed:
         ngx_pfree(r->pool, ctx->preallocated);
     }
 
+    ngx_http_gzip_filter_free_copy_buf(r, ctx);
+
     return NGX_ERROR;
 }
 
 
-static ngx_int_t
-ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
-    ngx_http_gzip_ctx_t *ctx)
+static void
+ngx_http_gzip_filter_memory(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
 {
-    int                    rc, wbits, memlevel;
+    int                    wbits, memlevel;
     ngx_http_gzip_conf_t  *conf;
 
     conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
@@ -410,16 +452,19 @@ ngx_http_gzip_filter_deflate_start(ngx_h
     wbits = conf->wbits;
     memlevel = conf->memlevel;
 
-    if (ctx->length > 0) {
+    if (r->headers_out.content_length_n > 0) {
 
         /* the actual zlib window size is smaller by 262 bytes */
 
-        while (ctx->length < ((1 << (wbits - 1)) - 262)) {
+        while (r->headers_out.content_length_n < ((1 << (wbits - 1)) - 262)) {
             wbits--;
             memlevel--;
         }
     }
 
+    ctx->wbits = wbits;
+    ctx->memlevel = memlevel;
+
     /*
      * We preallocate a memory for zlib in one buffer (200K-400K), this
      * decreases a number of malloc() and free() calls and also probably
@@ -433,6 +478,96 @@ ngx_http_gzip_filter_deflate_start(ngx_h
      */
 
     ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
+}
+
+
+static ngx_int_t
+ngx_http_gzip_filter_copy_recycled(ngx_http_gzip_ctx_t *ctx, ngx_chain_t *in)
+{
+    size_t               size, buffered;
+    ngx_buf_t           *b, *buf;
+    ngx_chain_t         *cl, **ll;
+    ngx_http_request_t  *r;
+
+    r = ctx->request;
+
+    r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
+
+    buffered = 0;
+    ll = &ctx->in;
+
+    for (cl = ctx->in; cl; cl = cl->next) {
+        buffered += cl->buf->last - cl->buf->pos;
+        ll = &cl->next;
+    }
+
+    while (in) {
+        cl = ngx_alloc_chain_link(r->pool);
+        if (cl == NULL) {
+            return NGX_ERROR;
+        }
+
+        b = in->buf;
+
+        size = b->last - b->pos;
+        buffered += size;
+
+        if (b->flush || b->last_buf) {
+            ctx->buffering = 0;
+
+        } else if (buffered > ctx->allocated / 2) {
+
+            /*
+             * With default memory settings zlib starts to output gzipped data
+             * only after it has got about 90K, so it makes sense to allocate
+             * zlib memory (200-400K) only after we have enough data
+             * to compress.  Although we copy recycled buffers, nevertheless
+             * for responses up to 120K this allows to allocate zlib memory,
+             * to compress and to output the response in one step
+             * using hot CPU cache.
+             */
+
+            ctx->buffering = 0;
+        }
+
+        if (ctx->buffering && size && b->recycled) {
+
+            buf = ngx_create_temp_buf(r->pool, size);
+            if (buf == NULL) {
+                return NGX_ERROR;
+            }
+
+            buf->last = ngx_cpymem(buf->pos, b->pos, size);
+            b->pos = b->last;
+
+            buf->last_buf = b->last_buf;
+            buf->tag = (ngx_buf_tag_t) &ngx_http_gzip_filter_module;
+
+            cl->buf = buf;
+
+        } else {
+            cl->buf = b;
+        }
+
+        *ll = cl;
+        ll = &cl->next;
+        in = in->next;
+    }
+
+    *ll = NULL;
+
+    return ctx->buffering ? NGX_OK : NGX_DONE;
+}
+
+
+static ngx_int_t
+ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
+    ngx_http_gzip_ctx_t *ctx)
+{
+    int                    rc;
+    ngx_http_gzip_conf_t  *conf;
+
+    conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
 
     ctx->preallocated = ngx_palloc(r->pool, ctx->allocated);
     if (ctx->preallocated == NULL) {
@@ -446,7 +581,7 @@ ngx_http_gzip_filter_deflate_start(ngx_h
     ctx->zstream.opaque = ctx;
 
     rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED,
-                      -wbits, memlevel, Z_DEFAULT_STRATEGY);
+                      - ctx->wbits, ctx->memlevel, Z_DEFAULT_STRATEGY);
 
     if (rc != Z_OK) {
         ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
@@ -454,8 +589,6 @@ ngx_http_gzip_filter_deflate_start(ngx_h
         return NGX_ERROR;
     }
 
-    r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
-
     ctx->last_out = &ctx->out;
     ctx->crc32 = crc32(0L, Z_NULL, 0);
     ctx->flush = Z_NO_FLUSH;
@@ -510,7 +643,24 @@ ngx_http_gzip_filter_add_data(ngx_http_r
         return NGX_DECLINED;
     }
 
+    if (ctx->copy_buf) {
+
+        /*
+         * to avoid CPU cache trashing we do not free() just quit buf,
+         * but postpone free()ing after zlib compressing and data output
+         */
+
+        ctx->copy_buf->next = ctx->copied;
+        ctx->copied = ctx->copy_buf;
+        ctx->copy_buf = NULL;
+    }
+
     ctx->in_buf = ctx->in->buf;
+
+    if (ctx->in_buf->tag == (ngx_buf_tag_t) &ngx_http_gzip_filter_module) {
+        ctx->copy_buf = ctx->in;
+    }
+
     ctx->in = ctx->in->next;
 
     ctx->zstream.next_in = ctx->in_buf->pos;
@@ -832,6 +982,20 @@ ngx_http_gzip_filter_free(void *opaque, 
 }
 
 
+static void
+ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r,
+    ngx_http_gzip_ctx_t *ctx)
+{
+    ngx_chain_t  *cl;
+
+    for (cl = ctx->copied; cl; cl = cl->next) {
+        ngx_pfree(r->pool, cl->buf->start);
+    }
+
+    ctx->copied = NULL;
+}
+
+
 static ngx_int_t
 ngx_http_gzip_add_variables(ngx_conf_t *cf)
 {
@@ -930,7 +1094,8 @@ ngx_http_gzip_merge_conf(ngx_conf_t *cf,
 
     ngx_conf_merge_value(conf->enable, prev->enable, 0);
 
-    ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
+    ngx_conf_merge_bufs_value(conf->bufs, prev->bufs,
+                              (128 * 1024) / ngx_pagesize, ngx_pagesize);
 
     ngx_conf_merge_value(conf->level, prev->level, 1);
     ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
diff --git a/src/http/modules/ngx_http_ssi_filter_module.c b/src/http/modules/ngx_http_ssi_filter_module.c
--- a/src/http/modules/ngx_http_ssi_filter_module.c
+++ b/src/http/modules/ngx_http_ssi_filter_module.c
@@ -935,12 +935,6 @@ ngx_http_ssi_output(ngx_http_request_t *
             break;
         }
 
-#if (NGX_HAVE_WRITE_ZEROCOPY)
-        if (b->zerocopy_busy) {
-            break;
-        }
-#endif
-
         if (b->shadow) {
             b->shadow->pos = b->shadow->last;
         }
diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -465,12 +465,6 @@ ngx_http_sub_output(ngx_http_request_t *
             break;
         }
 
-#if (NGX_HAVE_WRITE_ZEROCOPY)
-        if (b->zerocopy_busy) {
-            break;
-        }
-#endif
-
         if (b->shadow) {
             b->shadow->pos = b->shadow->last;
         }
diff --git a/src/http/modules/perl/nginx.pm b/src/http/modules/perl/nginx.pm
--- a/src/http/modules/perl/nginx.pm
+++ b/src/http/modules/perl/nginx.pm
@@ -47,7 +47,7 @@ our @EXPORT = qw(
     HTTP_INSUFFICIENT_STORAGE
 );
 
-our $VERSION = '0.7.27';
+our $VERSION = '0.7.28';
 
 require XSLoader;
 XSLoader::load('nginx', $VERSION);
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -76,6 +76,9 @@ ngx_int_t ngx_http_parse_header_line(ngx
     ngx_uint_t allow_underscores);
 ngx_int_t ngx_http_parse_multi_header_lines(ngx_array_t *headers,
     ngx_str_t *name, ngx_str_t *value);
+ngx_int_t ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len,
+    ngx_str_t *value);
+
 
 ngx_int_t ngx_http_find_server_conf(ngx_http_request_t *r);
 void ngx_http_update_location_config(ngx_http_request_t *r);
diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -1481,3 +1481,45 @@ ngx_http_parse_multi_header_lines(ngx_ar
 
     return NGX_DECLINED;
 }
+
+
+ngx_int_t
+ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len, ngx_str_t *value)
+{
+    u_char  *p;
+
+    if (r->args.len == 0) {
+        return NGX_DECLINED;
+    }
+
+    for (p = r->args.data; *p && *p != ' '; p++) {
+
+        /*
+         * although r->args.data is not null-terminated by itself,
+         * however, there is null in the end of request line
+         */
+
+        p = ngx_strcasestrn(p, (char *) name, len - 1);
+
+        if (p == NULL) {
+            return NGX_DECLINED;
+        }
+
+        if ((p == r->args.data || *(p - 1) == '&') && *(p + len) == '=') {
+
+            value->data = p + len + 1;
+
+            p = (u_char *) ngx_strchr(p, '&');
+
+            if (p == NULL) {
+                p = r->args.data + r->args.len;
+            }
+
+            value->len = p - value->data;
+
+            return NGX_OK;
+        }
+    }
+
+    return NGX_DECLINED;
+}
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2488,7 +2488,9 @@ ngx_http_upstream_finalize_request(ngx_h
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "finalize http upstream request: %i", rc);
 
-    *u->cleanup = NULL;
+    if (u->cleanup) {
+        *u->cleanup = NULL;
+    }
 
     if (u->state && u->state->response_sec) {
         tp = ngx_timeofday();
diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -772,51 +772,23 @@ ngx_http_variable_argument(ngx_http_requ
 {
     ngx_str_t *name = (ngx_str_t *) data;
 
-    u_char  *p, *arg;
-    size_t   len;
+    u_char     *arg;
+    size_t      len;
+    ngx_str_t   value;
 
-    if (r->args.len == 0) {
+    len = name->len - (sizeof("arg_") - 1);
+    arg = name->data + sizeof("arg_") - 1;
+
+    if (ngx_http_arg(r, arg, len, &value) != NGX_OK) {
         v->not_found = 1;
         return NGX_OK;
     }
 
-    len = name->len - 1 - (sizeof("arg_") - 1);
-    arg = name->data + sizeof("arg_") - 1;
-
-    for (p = r->args.data; *p && *p != ' '; p++) {
-
-        /*
-         * although r->args.data is not null-terminated by itself,
-         * however, there is null in the end of request line
-         */
-
-        p = ngx_strcasestrn(p, (char *) arg, len);
-
-        if (p == NULL) {
-            v->not_found = 1;
-            return NGX_OK;
-        }
-
-        if ((p == r->args.data || *(p - 1) == '&') && *(p + len + 1) == '=') {
-
-            v->data = p + len + 2;
-
-            p = (u_char *) ngx_strchr(p, '&');
-
-            if (p == NULL) {
-                p = r->args.data + r->args.len;
-            }
-
-            v->len = p - v->data;
-            v->valid = 1;
-            v->no_cacheable = 0;
-            v->not_found = 0;
-
-            return NGX_OK;
-        }
-    }
-
-    v->not_found = 1;
+    v->data = value.data;
+    v->len = value.len;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
 
     return NGX_OK;
 }
diff --git a/src/os/unix/ngx_freebsd.h b/src/os/unix/ngx_freebsd.h
--- a/src/os/unix/ngx_freebsd.h
+++ b/src/os/unix/ngx_freebsd.h
@@ -14,7 +14,6 @@ ngx_chain_t *ngx_freebsd_sendfile_chain(
 extern int         ngx_freebsd_kern_osreldate;
 extern int         ngx_freebsd_hw_ncpu;
 extern u_long      ngx_freebsd_net_inet_tcp_sendspace;
-extern int         ngx_freebsd_kern_ipc_zero_copy_send;
 
 extern ngx_uint_t  ngx_freebsd_sendfile_nbytes_bug;
 extern ngx_uint_t  ngx_freebsd_use_tcp_nopush;
diff --git a/src/os/unix/ngx_freebsd_init.c b/src/os/unix/ngx_freebsd_init.c
--- a/src/os/unix/ngx_freebsd_init.c
+++ b/src/os/unix/ngx_freebsd_init.c
@@ -19,9 +19,6 @@ u_long  ngx_freebsd_net_inet_tcp_sendspa
 /* FreeBSD 4.9 */
 int     ngx_freebsd_machdep_hlt_logical_cpus;
 
-/* FreeBSD 5.0 */
-int     ngx_freebsd_kern_ipc_zero_copy_send;
-
 
 ngx_uint_t  ngx_freebsd_sendfile_nbytes_bug;
 ngx_uint_t  ngx_freebsd_use_tcp_nopush;
@@ -68,10 +65,6 @@ sysctl_t sysctls[] = {
       &ngx_freebsd_kern_ipc_somaxconn,
       sizeof(ngx_freebsd_kern_ipc_somaxconn), 0 },
 
-    { "kern.ipc.zero_copy.send",
-      &ngx_freebsd_kern_ipc_zero_copy_send,
-      sizeof(ngx_freebsd_kern_ipc_zero_copy_send), 0 },
-
     { NULL, NULL, 0, 0 }
 };
 
diff --git a/src/os/unix/ngx_os.h b/src/os/unix/ngx_os.h
--- a/src/os/unix/ngx_os.h
+++ b/src/os/unix/ngx_os.h
@@ -13,7 +13,6 @@
 
 
 #define NGX_IO_SENDFILE    1
-#define NGX_IO_ZEROCOPY    2
 
 
 typedef ssize_t (*ngx_recv_pt)(ngx_connection_t *c, u_char *buf, size_t size);