Date: Fri, 20 Apr 2018 14:15:34 +0800 From: Julian Elischer <julian@freebsd.org> To: Garrett Wollman <wollman@bimajority.org>, freebsd-net@freebsd.org Subject: Re: Diagnosing terrible ixl performance Message-ID: <ca516ceb-fd0d-16da-0a7e-90763a0eb976@freebsd.org> In-Reply-To: <23257.26265.720293.659892@hergotha.csail.mit.edu> References: <23257.26265.720293.659892@hergotha.csail.mit.edu>
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On 20/4/18 12:03 pm, Garrett Wollman wrote: > I'm commissioning a new NFS server with an Intel dual-40G XL710 > interface, running 11.1. I have a few other servers with this > adapter, although not running 40G, and they work fine so long as you > disable TSO. This one ... not so much. On the receive side, it gets > about 600 Mbit/s with lots of retransmits. On the *sending* side, > though, it's not even able to sustain 10 Mbit/s -- but there's no > evidence of retransmissions, it's just sending really really slowly. > (Other machines with XL710 adapters are able to sustain full 10G.) > There is no evidence of any errors on either the adapter or the switch > it's connected to. > > So far, I've tried: > > - Using the latest Intel driver (no change) > - Using the latest Intel firmware (breaks the adapter) > - Disabling performance tweaks in loader.conf and sysctl.conf > - Changing congestion-control algorithms replacing card? obvious but you don't list it... > > Anyone have suggestions while I still have time to test this? (My > plan B is to fall back to an X520 card that I have in my spares kit, > because I *know* those work great with no faffing about.) Any > relevant MIBs to inspect? > > The test I'm doing here is simple iperf over TCP, with MTU 9120. It > takes about 10 seconds for the sending side to complete, but buffers > are severely constipated for 20 seconds after that (delaying all > traffic, including ssh connections). > > I'm at the point of trying different switch ports just to eliminate > that as a possibility. that is also a possibility, as well as swap cables with a good machine... > > -GAWollman > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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