From: Peter Xu <peterx@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] vhost: correctly check the iova range when waking virtqueue
Date: Fri, 24 Aug 2018 17:36:35 +0800 [thread overview]
Message-ID: <20180824093635.GC3020@xz-x1> (raw)
In-Reply-To: <20180824085313.21798-1-jasowang@redhat.com>
On Fri, Aug 24, 2018 at 04:53:13PM +0800, Jason Wang wrote:
> We don't wakeup the virtqueue if the first byte of pending iova range
> is the last byte of the range we just got updated. This will lead a
> virtqueue to wait for IOTLB updating forever. Fixing by correct the
> check and wake up the virtqueue in this case.
>
> Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API")
> Reported-by: Peter Xu <peterx@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Without this patch, this command will trigger the IO hang merely every
time from host to guest:
netperf -H 1.2.3.4 -l 5 -t TCP_RR -- -b 100
After applying, I can run it 10 times continuously without a problem.
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: Peter Xu <peterx@redhat.com>
Thanks,
--
Peter Xu
next prev parent reply other threads:[~2018-08-24 9:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-24 8:53 [PATCH net] vhost: correctly check the iova range when waking virtqueue Jason Wang
2018-08-24 9:36 ` Peter Xu [this message]
2018-08-24 11:02 ` Michael S. Tsirkin
2018-08-26 0:40 ` David Miller
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