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Date:   Thu, 17 Dec 2020 11:19:57 +0800
From:   Jason Wang <>
To:     "Michael S. Tsirkin" <>,
        wangyunjian <>
Subject: Re: [PATCH net v2 2/2] vhost_net: fix high cpu load when sendmsg

On 2020/12/16 下午5:23, Michael S. Tsirkin wrote:
> On Wed, Dec 16, 2020 at 04:20:37PM +0800, wangyunjian wrote:
>> From: Yunjian Wang<>
>> Currently we break the loop and wake up the vhost_worker when
>> sendmsg fails. When the worker wakes up again, we'll meet the
>> same error. This will cause high CPU load. To fix this issue,
>> we can skip this description by ignoring the error. When we
>> exceeds sndbuf, the return value of sendmsg is -EAGAIN. In
>> the case we don't skip the description and don't drop packet.
> Question: with this patch, what happens if sendmsg is interrupted by a signal?

Since we use MSG_DONTWAIT, we don't need to care about signal I think.



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