That ticket does look like the same issue I'm having as I was indeed using timer_resolution. The problem seems to have coincided with a recent Debian kernel update, so it's possible they backported those changes. I have removed timer_resolution from my config and so far have been unable to reproduce the issue.
Thanks for the quick reply! Regards, Richard. On Tue, Jan 31, 2017 at 4:32 PM, Maxim Dounin <[email protected]> wrote: > Hello! > > On Tue, Jan 31, 2017 at 04:19:59PM +0100, Richard Stanway wrote: > > > Hi all, > > I'm experiencing odd behavior with some larger HTTP file downloads from > my > > site. The files will download for a seemingly random amount of bytes then > > the connection freezes until "send_timeout" expires, at which point the > > error log shows "client timed out (110: Connection timed out) while > sending > > response to client". > > > > A tcpdump shows both ends successfully passing packets with no packet > loss. > > nginx is pretty stock from the nginx.org repository, no 3rd party > modules > > or complex options, mostly static files and fastcgi / PHP. The behavior > is > > very intermittent, but happens regardless of client browser / IP / > > requested file. > > > > I was able to captured a debug log when this happened, it is available at > > https://hastebin.com/tevusuhobe.m (some rewrite details and variables > have > > been omitted) > > [...] > > > sendfile, tcp_nopush, tcp_nodelay are enabled. > > accept_mutex, aio is disabled. > > > > Linux karak 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) > > x86_64 GNU/Linux > > > > I've also tried mainline nginx/1.11.9 from the nginx.org repository and > the > > problem persisted. Any advice on what I should be looking at to resolve > > this would be very welcome! > > This sounds similar to https://trac.nginx.org/nginx/ticket/1174 > (though the kernel looks old enough, but there may by backports). > Are you using timer_resolution? > > -- > Maxim Dounin > http://nginx.org/ > _______________________________________________ > nginx mailing list > [email protected] > http://mailman.nginx.org/mailman/listinfo/nginx >
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