linux-kernel - Re: [PATCH net,stable v4 0/3] vhost: fix a few skb leaks

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Date:   Fri, 1 Dec 2017 16:47:59 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     wexu@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jasowang@...hat.com,
        mjrosato@...ux.vnet.ibm.com
Subject: Re: [PATCH net,stable v4 0/3]  vhost: fix a few skb leaks

On Fri, Dec 01, 2017 at 05:10:35AM -0500, wexu@...hat.com wrote:
> From: Wei Xu <wexu@...hat.com>
> 
> Matthew found a roughly 40% tcp throughput regression with commit
> c67df11f(vhost_net: try batch dequing from skb array) as discussed
> in the following thread:
> https://www.mail-archive.com/netdev@vger.kernel.org/msg187936.html

Series

Acked-by: Michael S. Tsirkin <mst@...hat.com>


> v4:
> - fix zero iov iterator count in tap/tap_do_read()(Jason)
> - don't put tun in case of EBADFD(Jason)
> - Replace msg->msg_control with new 'skb' when calling tun/tap_do_read()
> 
> v3:
> - move freeing skb from vhost to tun/tap recvmsg() to not
>   confuse the callers.
> 
> v2:
> - add Matthew as the reporter, thanks matthew.
> - moving zero headcount check ahead instead of defer consuming skb
>   due to jason and mst's comment.
> - add freeing skb in favor of recvmsg() fails.
> 
> Wei Xu (3):
>   vhost: fix skb leak in handle_rx()
>   tun: free skb in early errors
>   tap: free skb if flags error
> 
>  drivers/net/tap.c   | 14 ++++++++++----
>  drivers/net/tun.c   | 24 ++++++++++++++++++------
>  drivers/vhost/net.c | 20 ++++++++++----------
>  3 files changed, 38 insertions(+), 20 deletions(-)
> 
> -- 
> 1.8.3.1