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

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Message-Id: <9ef31370-4042-b701-e983-90b8f20a2a39@linux.vnet.ibm.com>
Date:   Fri, 1 Dec 2017 09:54:02 -0500
From:   Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, wexu@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jasowang@...hat.com
Subject: Re: [PATCH net,stable v4 0/3] vhost: fix a few skb leaks

On 12/01/2017 09:47 AM, Michael S. Tsirkin wrote:
> 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>

Tested this series on a z13 (s390x) on top of net-next using 4GB/4vcpu
guests.  Verified that both the reported TCP throughput regression and
memory leak are resolved.

net-next:  19.83 Gb/s
net-next+: 35.02 Gb/s

Thanks all!

Matt

> 
> 
>> 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
>