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Date:      Fri, 17 Mar 2017 13:08:14 +0300
From:      Slawa Olhovchenkov <slw@zxy.spb.ru>
To:        John Jasen <jjasen@gmail.com>
Cc:        Navdeep Parhar <nparhar@gmail.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, "Caraballo-vega, Jordan A." <jordancaraballo87@gmail.com>
Subject:   Re: bad throughput performance on multiple systems: Re: Fwd: Re: Disappointing packets-per-second performance results on a Dell,PE R530
Message-ID:  <20170317100814.GN70430@zxy.spb.ru>
In-Reply-To: <CAACLuR29xQhDWATRheBaOU2vtiYp61JgDKHaXum%2BU32MBDLBzw@mail.gmail.com>
References:  <7d349edd-0c81-2e3f-d3b9-27af232de76d@gmail.com> <20170209153409.GG41673@dwarf> <6ad029e0-86c6-af3d-8fc3-694d4bcdc683@gmail.com> <b460cc49-364a-34fb-e212-582730546dee@gmail.com> <20170312231826.GV15630@zxy.spb.ru> <74654520-b8b6-6118-2e46-902a8ea107ac@gmail.com> <CAPFoGT9k4HfDCQ7wJPDFMTrJTtDyc9uK_ma9ubneDhVSsS-jcA@mail.gmail.com> <173fffac-7ae2-786a-66c0-e9cd7ab78f44@gmail.com> <CAPFoGT-BAMpj34wtB06dxMKk%2B87OEOs5-qu%2BRLVz=aPrhX6hDA@mail.gmail.com> <CAACLuR29xQhDWATRheBaOU2vtiYp61JgDKHaXum%2BU32MBDLBzw@mail.gmail.com>

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On Thu, Mar 16, 2017 at 03:50:42PM -0400, John Jasen wrote:

> As a few points of note, partial resolution, and curiosity:
> 
> Following down leads that 11-STABLE had tryforward improvements over
> 11-RELENG, I upgraded. The same tests (24 client streams over UDP with
> small packets), the system went from passing 1.7m pps to about 2.5m.
> 
> Following indications from Navdeep Parhar that UDP queue hashing is not as
> efficient as it could be, we started running the tests with various powers
> of 2 streams (2,4,8,16,32) -- and were able to push the system up to 5m pps.
> 
> We are currently seeing in the tests approximately 10-11m pps on the
> outside interface, around 5-6m dropped, and 5 million passed.

You want more?

> On Mon, Mar 13, 2017 at 1:31 PM, Navdeep Parhar <nparhar@gmail.com> wrote:
> 
> > On Mon, Mar 13, 2017 at 10:13 AM, John Jasen <jjasen@gmail.com> wrote:
> > > On 03/13/2017 01:03 PM, Navdeep Parhar wrote:
> > >
> > >> On Sun, Mar 12, 2017 at 5:35 PM, John Jasen <jjasen@gmail.com> wrote:
> > >>> UDP traffic. dmesg reports 16 txq, 8 rxq -- which is the default for
> > >>> Chelsio.
> > >>>
> > >> I don't recall offhand, but UDP might be using 2-tuple hashing by
> > >> default and that might affect the distribution of flows across queues.
> > >> Are there senders generating IP fragments by any chance (that'll
> > >> depend on the "send size" that your UDP application is using)?
> > >
> > > No, they're not fragmenting.
> > >
> > >> Have you tried limiting the adapter's rx ithreads to the CPU that the
> > >> PCIe slot with the adapter is wired to?
> > >
> > > Above and beyond the use of cpuset, you mean?
> >
> > I meant cpuset.
> >
> > If possible, try your experiments on a single socket system.
> >
> > Regards,
> > Navdeep
> >



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