netdev - Re: Socket buffer sizes with autotuning

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Message-ID: <d1c2719f0805122100u7e550820xff6fcdbc1e538948@mail.gmail.com>
Date:	Mon, 12 May 2008 21:00:08 -0700
From:	"Jerry Chu" <hkchu@...gle.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: Socket buffer sizes with autotuning

Does xchg() return the old value? (Can't find any comments on it.)

Jerry

On Mon, May 12, 2008 at 8:58 PM, David Miller <davem@...emloft.net> wrote:
> From: "Jerry Chu" <hkchu@...gle.com>
>  Date: Mon, 12 May 2008 20:56:16 -0700
>
>
>  > If true, can we use some atomic operation to zap in_flight, but also
>  > return to the caller if in_flight has been nullified already so that
>  > the accounting can be handled correctly?
>
>  xchg() should work for that purpose.
>
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