well, due to the high network traffic, have you make the 10Ge NIC irq balanced to multiple cpu?
and can you show us the threading CPU usage in the top? thanks 在 2013-3-21，下午7:42，Philip <[email protected]> 写道： > I've just upgraded to ATS 3.3.1-dev. The problem still is the same: > http://i.imgur.com/1pHWQy7.png > > The load goes on one core. (The server is only running ATS) > > 2013/3/21 Philip <[email protected]> > Hi Igor, > > I am using ATS 3.2.4, Debian 6 (Squeeze) and a 3.2.13 Kernel. > > I was using the "traffic_line -r" command to see the number of origin > connections growing and htop/atop to see that only one core is 100% utilized. > I've already tested the following changes to the configuration: > > proxy.config.accept_threads -> 0 > > proxy.config.exec_thread.autoconfig -> 0 > proxy.config.exec_thread.limit -> 120 > > They had no effect there is still the one core that becomes 100% utilized and > turns out to be a bottleneck. > > Best Regards > Philip > > > 2013/3/21 Igor Galić <[email protected]> > Hi Philip, > > Let's start with some simple data mining: > > which version of ATS are you running? > What OS/Distro/version are you running it on? > > Are you looking at stats_over_http's output to determine what's going on in > ATS? > > -- i > > I have noticed the following strange behavior: Once the number of origin > connections start to increase and the proxying speed collapses the first core > is at 100% utilization while the others are not even close to that. It seems > like the origin requests are handled by the first core only. Is this expected > behavior that can be changed by editing the configuration or is this a bug? > > > > 2013/3/20 Philip <[email protected]> > Hi, > > I am running ATS on a pretty large server with two physical 6 core XEON CPUs > and 22 raw device disks. I want to use that server as a frontend for several > fileservers. It is currently configured to be infront of two file-servers. > The load on the ATS server is pretty low. About 1-4% disk utilization and > 500Mbps of outgoing traffic. > > Once I direct the traffic of the third file server towards ATS something > strange happens: > > - The number of origin connection increases continually. > - Requests that hit ATS and are not cached are served really slow to the > client (about 35 kB/s) while requests that are served from the cache are > blazingly fast. > > The ATS server has a dedicated 10Gbps port that is not maxed out, no CPU core > is maxxed, there is no swapping, there are no error logs and also the origin > servers are not heavy utilized. It feels like there are not enough workers to > process the origin requests. > > Is there anything I can do to check if my theory is right and a way to > increase the number of origin workers? > > Best Regards > Philip > > > > > -- > Igor Galić > > Tel: +43 (0) 664 886 22 883 > Mail: [email protected] > URL: http://brainsware.org/ > GPG: 6880 4155 74BD FD7C B515 2EA5 4B1D 9E08 A097 C9AE > > >
