Date: Wed, 12 May 2010 13:28:14 -0700 From: Jack Vogel <jfvogel@gmail.com> To: Andrew Boyer <aboyer@averesystems.com> Cc: freebsd-net@freebsd.org Subject: Re: ixgbe 2.1.7 can't disable LRO on 82599? Message-ID: <AANLkTikkAFPHmJC27D-OWbaoP_lFvIft3H2Vo-Zye9HW@mail.gmail.com> In-Reply-To: <D20C2626-BE6E-408A-8FF8-4BA7DF5589D6@averesystems.com> References: <D20C2626-BE6E-408A-8FF8-4BA7DF5589D6@averesystems.com>
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Oh, this is because the 82598 is doing HW RSC which is a different code path from the LRO that the 598 does, and that may be the problem, I will need to look into that. Thanks for the report. And, yes, LRO is a major improvement in 10G performance, as is TSO. Are you sure you have no alternative to disabling? Cheers, Jack On Wed, May 12, 2010 at 12:03 PM, Andrew Boyer <aboyer@averesystems.com>wrote: > Hello all, > I'm using the 2.1.7 version of ixgbe from -CURRENT, backported to FreeBSD > 7.1. With some fiddling it seems to work on both 82598 and 82599 > controllers. > > On 82598, 'ifconfig ix0 -lro' causes dev.ix.0.counters.rxr0.lro_queued and > ...lro_flushed to stop incrementing, as expected. There's also a > significant throughput hit which would seem to indicate that it took effect. > > However, it appears that LRO is always enabled on 82599. 'ifconfig ix0 > -lro' removes the LRO flag from the port in ifconfig but the ...hw_lro_merge > counter continues to increase. The throughput reported by the iperf port is > the same with or without LRO on. > > Any advice? Am I misinterpreting something? > > Thanks, > Andrew > > P.S. We need to disable LRO because we don't have Appropriate Byte > Counting support and LRO causes TCP ACK havoc without it. > > -------------------------------------------------- > Andrew Boyer aboyer@averesystems.com > > > > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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