Ok, I have a virtual machine which has a residual kernel of 3.16.0-0.bpo.4 (Debian wheezy-backport's) available I confirmed the issue is replicatable on that machine too.
The testing methodology is using ab from 12 other remote servers (hopefully in order to prevent collisions) at a fairly low rate of 1r/s (the virtual machine with this older kernel is not particularly large). During this testing zero requests where received at one sampled process, while the first process showed approximately 10% CPU usage. Regards, Mathew On Wed, Nov 25, 2015 at 12:42 AM, Valentin V. Bartenev <[email protected]> wrote: > On Wednesday 25 November 2015 00:25:19 SplitIce wrote: > > Hi all, > > > > I couldn't find anything in the mailing list about this issue, surely we > > are not the only one? > > > > When activating reuseport I am seeing all requests be served from a > single > > nginx process. All others are just idling (SIGALARM interruption of > > epoll_wait / epoll_wait timeout according to strace). > > > > Process 442 attached - interrupt to quit > > epoll_wait(60, 8225010, 512, 4294967295) = -1 EINTR (Interrupted system > > call) > > --- SIGALRM (Alarm clock) @ 0 (0) --- > > rt_sigreturn(0xe) = -1 EINTR (Interrupted system > call) > > epoll_wait(60, 8225010, 512, 4294967295) = -1 EINTR (Interrupted system > > call) > > --- SIGALRM (Alarm clock) @ 0 (0) --- > > > > > > > > This only occurs with reuseport, as soon as it is disabled the load is > > correctly distributed again. > > > > Configuration: > > worker_processes 12; # 2x8 cores on server > > multiple server blocks on different IP's and ports with reuseaddr. > > Linux kernel: 3.18.20 > > > > Server nic has interrupts over all cores: > > > > # sudo ethtool -S eth0 |grep rx | grep pack > > rx_packets: 11244443305 > > rx_queue_0_packets: 1381842455 > > rx_queue_1_packets: 1373383493 > > rx_queue_2_packets: 1490287703 > > rx_queue_3_packets: 1440591930 > > rx_queue_4_packets: 1378550073 > > rx_queue_5_packets: 1373473609 > > rx_queue_6_packets: 1437806438 > > > > > > We have also experimented with disabling iptables and anything else on > the > > server that could be interfering. I have also loaded it onto three other > > fresh servers with the same kernel (same OS image), but with different > nic > > cards (with and without multiple rx queues) with no changes. > > > > This has me stumped. Ideas? > > > > You should try another kernel. > > wbr, Valentin V. Bartenev > > _______________________________________________ > nginx-devel mailing list > [email protected] > http://mailman.nginx.org/mailman/listinfo/nginx-devel >
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