netdev - Re: [PATCH net-next v2] unix: add read side socket memory accounting for dgram sockets

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Message-Id: <20140304.153732.1314382655798460205.davem@davemloft.net>
Date:	Tue, 04 Mar 2014 15:37:32 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org, yannick@...hler.name,
	eric.dumazet@...il.com, xiyou.wangcong@...il.com, dan@...dstab.net
Subject: Re: [PATCH net-next v2] unix: add read side socket memory
 accounting for dgram sockets

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Tue, 4 Mar 2014 21:13:36 +0100

> Just a small followup:
> 
> Because of the additional sock_wfree during skb handover in unix_dgram_sendmsg
> the spinlock in __wake_up_sync_key is hit more often thus more cacheline
> bouncing.
> 
> Deferring the POLLOUT notification after the sock_rfree in unix_dgram_recvmsg
> already halfed the number of context switches with the new patch.
> 
> I try to play with some other ideas this week and will submit new patch with
> performance numbers.
> 
> Haven't noticed any problems with the additional atomic operations
> performance-wise so far.

Ok, thanks for the update.
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