From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58503) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cOMKU-0005Rd-5g for qemu-devel@nongnu.org; Tue, 03 Jan 2017 05:28:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cOMKQ-0003rj-7f for qemu-devel@nongnu.org; Tue, 03 Jan 2017 05:28:30 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42356) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cOMKQ-0003rY-1G for qemu-devel@nongnu.org; Tue, 03 Jan 2017 05:28:26 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2776B83F45 for ; Tue, 3 Jan 2017 10:28:26 +0000 (UTC) References: <20161230104130.29ff671b@x240.lan> <4eda1813-d732-5dfc-e6ff-29ac95fe22d8@redhat.com> From: Jason Wang Message-ID: <8aae955f-44ff-134e-818f-31b0bd510ba1@redhat.com> Date: Tue, 3 Jan 2017 18:28:18 +0800 MIME-Version: 1.0 In-Reply-To: <4eda1813-d732-5dfc-e6ff-29ac95fe22d8@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] vhost-user breaks after 96a3d98. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Flavio Leitner , "Michael S. Tsirkin" Cc: qemu-devel On 2017=E5=B9=B401=E6=9C=8803=E6=97=A5 11:09, Jason Wang wrote: > > > On 2016=E5=B9=B412=E6=9C=8830=E6=97=A5 20:41, Flavio Leitner wrote: >> Hi, >> >> While I was testing vhost-user using OVS 2.5 and DPDK 2.2.0 in the >> host and testpmd dpdk 2.2.0 in the guest, I found that the commit >> below breaks the environment and no packets gets into the guest. >> >> dpdk port --> OVS --> vhost-user --> guest --> testpmd >> ^--- drops here ^--- no packets here= . >> >> commit 96a3d98d2cdbd897ff5ab33427aa4cfb94077665 >> Author: Jason Wang >> Date: Mon Aug 1 16:07:58 2016 +0800 >> >> vhost: don't set vring call if no vector >> We used to set vring call fd unconditionally even if guest=20 >> driver does >> not use MSIX for this vritqueue at all. This will cause lots of >> unnecessary userspace access and other checks for drivers does=20 >> not use >> interrupt at all (e.g virtio-net pmd). So check and clean vring=20 >> call >> fd if guest does not use any vector for this virtqueue at >> all. >> [...] >> >> Thanks, > > Hi Flavio: > > Thanks for reporting this issue, could this be a bug of vhost-user? (I=20 > believe virito-net pmd does not use interrupt for rx/tx at all) > > Anyway, will try to reproduce it. > Could not reproduce this issue on similar setups (the only difference is=20 I don't create dpdk port) with dpdk 16.11 and ovs.git HEAD. Suspect an=20 issue dpdk. Will try OVS 2.5 + DPDK 2.2.0. Thanks