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From: David Miller <davem@davemloft.net>
Subject: Re: Socket buffer sizes with autotuning
Date: Mon, 12 May 2008 21:02:02 -0700 (PDT)
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From: "Jerry Chu" <hkchu@google.com>
Date: Mon, 12 May 2008 21:00:08 -0700

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

Yes, otherwise it wouldn't be very useful.