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Buffers reuse in chunked filter. There were 2 buffers allocated on each buffer chain sent through chunked filter (one buffer for chunk size, another one for trailing CRLF, about 120 bytes in total on 32-bit platforms). This resulted in large memory consumption with long-lived requests sending many buffer chains. Usual example of problematic scenario is streaming though proxy with proxy_buffering set to off. Introduced buffers reuse reduces memory consumption in the above problematic scenario. See here for initial report: http://mailman.nginx.org/pipermail/nginx/2010-April/019814.html
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 15 Sep 2011 15:25:42 +0000
parents 551102312e19
children
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<!ELEMENT configuration   (length, start, indent, changes+) >

<!ELEMENT length          (#PCDATA) >
<!ELEMENT start           (#PCDATA) >
<!ELEMENT indent          (#PCDATA) >

<!ELEMENT changes         (title, length,
                           bugfix, feature, change, workaround,
                           (month, month, month, month, month, month,
                            month, month, month, month, month, month)?) >

<!ATTLIST changes         lang ( ru | en) #REQUIRED>

<!ELEMENT title           (#PCDATA) >

<!ELEMENT bugfix          (#PCDATA) >
<!ELEMENT feature         (#PCDATA) >
<!ELEMENT change          (#PCDATA) >
<!ELEMENT workaround      (#PCDATA) >

<!ELEMENT month           (#PCDATA) >