From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] [net PATCH] i40e/i40evf: Limit TSO to 7 descriptors for payload instead of 8 per packet
Date: Wed, 30 Mar 2016 16:09:59 -0400 [thread overview]
Message-ID: <20160330200959.GI27540@oracle.com> (raw)
In-Reply-To: <20160330124135.000054c6@unknown>
On (03/30/16 12:41), Jesse Brandeburg wrote:
> This gets "Even Uglier", I've turned off all offloads at my receiver,
> enabled calling skb_linearize on *all* frames, which works fine for
> scp, but the receiver shows > MSS sized frames on the wire for
> rds-stress traffic.
fwiw, I was not able to reproduce this tx issue with iperf/netperf
etc either (I tried various perumtations of bidir, req-resp etc). One
difference between the rds-stress invocation and the other callers
is that this comes down via tcp_sendpage(), I dont know if there
is something in the sendpage path that i40e does not anticipate.
Other drivers (ixgbe etc) work fine, so my hunch would be that this
is specific to i40e (and not a skb_linearize bug) but I could be
wrong.
--Sowmini
next prev parent reply other threads:[~2016-03-30 20:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-30 6:44 [Intel-wired-lan] [net PATCH] i40e/i40evf: Limit TSO to 7 descriptors for payload instead of 8 per packet Alexander Duyck
2016-03-30 17:00 ` Sowmini Varadhan
2016-03-30 17:12 ` Alexander Duyck
2016-03-30 17:20 ` Sowmini Varadhan
2016-03-30 17:35 ` Alexander Duyck
2016-03-30 19:41 ` Jesse Brandeburg
2016-03-30 20:09 ` Sowmini Varadhan [this message]
2016-03-30 20:15 ` Eric Dumazet
2016-03-30 20:40 ` Sowmini Varadhan
2016-03-30 21:20 ` Alexander Duyck
2016-03-30 23:06 ` Alexander Duyck
2016-03-30 18:38 ` Jesse Brandeburg
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