Mark, Thanks!
Test app can specify how many pthread to handle connections. I have tried 4, 8, 16, etc, but none of them make significant difference. CPU usage on receive end is moderate (50-60%). If I want to poll aggressively to prevent any drop in UDP layer, then it might go up a bit. On the CPU set that handle network interrupts, I did pin those CPUs, I can see interrupt rate is pretty even on all CPUs involved. Since seeing a lot of rx_no_dma_resource and this counter is read out through 82599 controller, I like to know why it happened. Note: I already bumped rx ring size to maximum (4096) I can set in ethtool. BTW, what is ATR? I didn't set up any filter... Hank On Wed, Sep 7, 2016 at 2:19 PM, Rustad, Mark D <mark.d.rus...@intel.com> wrote: > Hank Liu <hank.tz...@gmail.com> wrote: > > *From:* Hank Liu [mailto:hank.tz...@gmail.com] >>> *Sent:* Wednesday, September 07, 2016 10:20 AM >>> *To:* Skidmore, Donald C <donald.c.skidm...@intel.com> >>> *Cc:* e1000-devel@lists.sourceforge.net >>> *Subject:* Re: [E1000-devel] Intel 82599 AXX10GBNIAIOM cards for 10G SFPs >>> UDP performance issue >>> >>> >>> >>> Thanks for quick response and helping. I guess I didn't make it clear is >>> that the application (receiver, sender) open 240 connections each >>> connection has 34 Mbps traffic. >>> >> > You say that there are 240 connections, but how many threads is your app > using? One per connection? What does the cpu utilization look like on the > receiving end? > > Also, the current ATR implementation does not support UDP, so you are > probably better off not pinning the app threads at all and trusting that > the scheduler will migrate them to the cpu that is getting their packets > via RSS. You should still set the affinity of the interrupts in that case. > The default number of queues should be fine. > > -- > Mark Rustad, Networking Division, Intel Corporation >
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