Date: Thu, 4 Jul 2013 09:16:10 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Lawrence Stewart" <lstewart@freebsd.org>, "Outback Dingo" <outbackdingo@gmail.com> Cc: Kevin Oberman <rkoberman@gmail.com>, net@freebsd.org Subject: Re: Terrible ix performance Message-ID: <BA1C98E0F99443E3912DCA97202CB448@multiplay.co.uk> References: <CAKYr3zyV74DPLsJRuDoRiYsYdAXs=EoqJ6%2B_k4hJiSnwq5zhUQ@mail.gmail.com> <51D3E5BC.1000604@freebsd.org> <CAKYr3zyWzQsFOrQ-MrGTdTzJzhP1kXNac%2BHu8NXfC_J6YJcOsg@mail.gmail.com> <51D42976.9020206@freebsd.org> <CAKYr3zyFF%2BA-OHsEL7t6rdv6Jc4c2ByvvRhV-Fv%2BPXt9Y-sXwg@mail.gmail.com> <E97FF575ED6A405FB13872854191BF3B@multiplay.co.uk> <CAN6yY1vg=KAAaJhG0p8pO6vRwL%2BypHXUfV2Uth70DYNNy04-Uw@mail.gmail.com> <51D4D77B.60804@freebsd.org> <CAKYr3zyzj=AFcGu62Je3gkZy%2BQP1aDZanYTQp%2BjsMgoWWjrnWA@mail.gmail.com> <51D4EECE.4010808@freebsd.org>
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----- Original Message -----
>> On Wed, Jul 3, 2013 at 10:01 PM, Lawrence Stewart>>
>> On 07/04/13 10:18, Kevin Oberman wrote:
>> > On Wed, Jul 3, 2013 at 4:21 PM, Steven Hartland
>> >>
>> >> Out of interest have you tried limiting the number of queues?
>> >>
>> >> If not give it a try see if it helps, add the following to
>> >> /boot/loader.conf:
>> >> hw.ixgbe.num_queues=1
>> >>
>> >> If nothing else will give you another data point.
>>
>> As noted in my first post to this thread, if iperf is able to push a
>> single flow at 8Gbps, then the NIC is unlikely to be the source of the
>> problem and trying to tune it is a waste of time (at least at this
>> stage).
>>
>> iperf tests memory-network-memory transfer speed without any disk
>> involvement, so the fact that it can get 8Gbps and ftp is getting around
>> 4Gbps implies that either the iperf TCP tuning is better (only likely to
>> be relevant if the RTT is very large - Outback Dingo you still haven't
>> provided us with the RTT) or the disk subsystem at one or both ends is
>> slowing things down.
That may not be all the story, you'll have significantly different data
patterns between the two, so don't discount anything till you've tested.
Regards
Steve
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