А все просто, в linux sendfile не асинхронный, увы.

Я все мечтаю дописать, но объемы работ пугают что бы этим заниматься for fun

At Thu, 29 Apr 2010 04:08:40 +0300,
Alex Vorona <voron@amhost.net> wrote:
>
> Привет,
>
> Как обычно, качаю по localhost, для получения длинных sendfile
>
> Linux 2.6.33.1-grsec x86_64
>
> nginx version: nginx/0.8.36
> TLS SNI support enabled
> configure arguments: --prefix=/usr --sbin-path=/usr/sbin/nginx
> --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error_log
> --pid-path=/var/run/nginx.pid --lock-path=/var/lock/nginx.lock --user=nginx --group=nginx
> --with-cc-opt=-I/usr/include --with-ld-opt=-L/usr/lib
> --http-log-path=/var/log/nginx/access_log
> --http-client-body-temp-path=/var/tmp/nginx/client
> --http-proxy-temp-path=/var/tmp/nginx/proxy
> --http-fastcgi-temp-path=/var/tmp/nginx/fastcgi --with-pcre --with-file-aio
> --with-aio_module --with-debug --with-http_flv_module --with-http_stub_status_module
> --with-http_realip_module --with-http_ssl_module --without-mail_imap_module
> --without-mail_pop3_module --without-mail_smtp_module
> ...
> checking for epoll ... found
> checking for sendfile() ... found
> checking for sendfile64() ... found
> ...
>
> После длинного sendfile, например
>
> sendfile(8, 9, [827358294], 2147480490) = 2147479552
>
> nginx перестаёт отдавать данные, соединение зависает. В debug log что-то такое
> 2010/04/29 03:23:54 [debug] 32260#0: *13 write old buf t:0 f:1 0000000000000000, pos
> 0000000000000000, size: 0 file: 826800830, size: 6335388760
> 2010/04/29 03:23:54 [debug] 32260#0: *13 http write filter: l:1 f:0 s:6335388760
>
> 2010/04/29 03:23:54 [debug] 32260#0: *13 http write filter limit 0
>
> 2010/04/29 03:23:54 [debug] 32260#0: *13 sendfile: @826800830 2147480898
>
> 2010/04/29 03:23:54 [debug] 32260#0: *13 sendfile: 2147479552, @826800830
> 2147479552:2147480898
> 2010/04/29 03:23:54 [debug] 32260#0: *13 http write filter 00000000006CC868
>
> 2010/04/29 03:23:54 [debug] 32260#0: *13 http copy filter: -2
> "/tshare/tt/hdclub/Duo.luo.tian.shi.(Fallen.Angels).1995.720p.BluRay.Rus.Chi.HDCLUB.mkv?"
>
> 2010/04/29 03:23:54 [debug] 32260#0: *13 http writer output filter: -2,
> "/tshare/tt/hdclub/Duo.luo.tian.shi.(Fallen.Angels).1995.720p.BluRay.Rus.Chi.HDCLUB.mkv
> 2010/04/29 03:23:54 [debug] 32260#0: *13 event timer: 3, old: 1272501234546, new:
> 1272501234567
> 2010/04/29 03:26:23 [debug] 32260#0: *13 http run request:
> "/tshare/tt/hdclub/Duo.luo.tian.shi.(Fallen.Angels).1995.720p.BluRay.Rus.Chi.HDCLUB.mkv?"
>
> 2010/04/29 03:26:23 [debug] 32260#0: *13 http test reading
>
> 2010/04/29 03:26:23 [info] 32260#0: *13 client closed prematurely connection while sending
> response to client,
>
>
> Включение sendfile_max_chunk 1M устраняет проблему.
>
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--
wbr, Kirill

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