netdev - Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

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Message-ID: <1340786710.26242.37.camel@edumazet-glaptop>
Date:	Wed, 27 Jun 2012 10:45:10 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	David Miller <davem@...emloft.net>, hans.schillstrom@...csson.com,
	subramanian.vijay@...il.com, dave.taht@...il.com,
	netdev@...r.kernel.org, ncardwell@...gle.com, therbert@...gle.com,
	mph@...h.dk
Subject: Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

On Wed, 2012-06-27 at 10:21 +0200, Jesper Dangaard Brouer wrote:

> It works because we have a spinlock problem in the code... Perhaps, they
> did it, because we have have locking/contention problem, not the other
> way around ;-)  How about fixing the code instead? ;-)))

The socket lock is currently mandatory.

It's really _hard_ to remove it, your attempts added a lot of races.

I want to do it properly, adding needed RCU and array of spinlocks were
appropriate.

Hopefully, its easier than the RCU conversion I did for the lookups of
ESTABLISHED/TIMEWAIT sockets.


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