From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowmini Varadhan Date: Wed, 30 Mar 2016 16:09:59 -0400 Subject: [Intel-wired-lan] [net PATCH] i40e/i40evf: Limit TSO to 7 descriptors for payload instead of 8 per packet In-Reply-To: <20160330124135.000054c6@unknown> References: <20160330064213.12927.46852.stgit@localhost.localdomain> <20160330170011.GB27540@oracle.com> <20160330172001.GD27540@oracle.com> <20160330124135.000054c6@unknown> Message-ID: <20160330200959.GI27540@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: 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 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowmini Varadhan Subject: Re: [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 Message-ID: <20160330200959.GI27540@oracle.com> References: <20160330064213.12927.46852.stgit@localhost.localdomain> <20160330170011.GB27540@oracle.com> <20160330172001.GD27540@oracle.com> <20160330124135.000054c6@unknown> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Alexander Duyck , Alexander Duyck , Netdev , intel-wired-lan , Jeff Kirsher To: Jesse Brandeburg Return-path: Received: from userp1040.oracle.com ([156.151.31.81]:44938 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755761AbcC3UKO (ORCPT ); Wed, 30 Mar 2016 16:10:14 -0400 Content-Disposition: inline In-Reply-To: <20160330124135.000054c6@unknown> Sender: netdev-owner@vger.kernel.org List-ID: 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