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Re: [Qemu-devel] vhost-user breaks after 96a3d98.
From: |
Flavio Leitner |
Subject: |
Re: [Qemu-devel] vhost-user breaks after 96a3d98. |
Date: |
Tue, 3 Jan 2017 15:33:12 -0200 |
On Tue, 3 Jan 2017 18:28:18 +0800
Jason Wang <address@hidden> wrote:
> On 2017年01月03日 11:09, Jason Wang wrote:
> >
> >
> > On 2016年12月30日 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 <address@hidden>
> >> 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
> >> driver does
> >> not use MSIX for this vritqueue at all. This will cause lots of
> >> unnecessary userspace access and other checks for drivers does
> >> not use
> >> interrupt at all (e.g virtio-net pmd). So check and clean vring
> >> 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
> > 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
> I don't create dpdk port) with dpdk 16.11 and ovs.git HEAD. Suspect an
> issue dpdk. Will try OVS 2.5 + DPDK 2.2.0.
Yeah, that's the combo I am testing and seeing the issue. I found the
commit after bisecting qemu and then confirmed by testing up to the
previous commit (works okay) and then the commit above (fails).
I still have my test environment available, so I would be able to test
any patch you might have.
Thanks,
--
Flavio
Re: [Qemu-devel] vhost-user breaks after 96a3d98.,
Flavio Leitner <=