Terrible ix performance
killing at multiplay.co.uk
Thu Jul 4 08:16:03 UTC 2013
----- 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
>> 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.
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