From: Andi Kleen <ak@suse.de>
To: Brent Cook <bcook@bpointsys.com>
Cc: Bill Fink <billfink@mindspring.com>,
Jeff Garzik <jeff@garzik.org>,
phil@ipom.com, davem@davemloft.net, netdev@vger.kernel.org
Subject: Re: reminder, 2.6.18 window...
Date: Fri, 26 May 2006 11:52:39 +0200 [thread overview]
Message-ID: <200605261152.40101.ak@suse.de> (raw)
In-Reply-To: <200605250805.38241.bcook@bpointsys.com>
> The current patch is fine if your hardware implements the required atomicity
> itself.
Near all do optionally, but it would make increasing the statistics a magnitude
more expensive.
Atomic operations don't come cheap on modern systems. And you would need
to change the fast path increments to atomic for this.
I suspect it could be done without atomics with some tricks (e.g. use a double
set of counters and switch on clear and use RCU), but it would make the whole
thing quite complex and still have more overhead in the fast path than
the current code.
-Andi
next prev parent reply other threads:[~2006-05-26 9:52 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-24 1:22 reminder, 2.6.18 window David Miller
2006-05-24 8:01 ` Phil Dibowitz
2006-05-24 18:21 ` jamal
2006-05-24 18:23 ` Jeff Garzik
2006-05-24 18:34 ` Rick Jones
2006-05-24 18:56 ` Phil Dibowitz
2006-05-24 19:05 ` Jeff Garzik
2006-05-24 19:14 ` Phil Dibowitz
2006-05-24 20:01 ` Brent Cook
2006-05-24 20:08 ` Jeff Garzik
2006-05-25 7:23 ` Bill Fink
2006-05-25 13:05 ` Brent Cook
2006-05-25 16:12 ` Bill Fink
2006-05-25 17:59 ` Phil Dibowitz
2006-05-25 18:41 ` Brent Cook
2006-05-25 19:22 ` Phil Dibowitz
2006-05-25 20:29 ` David Miller
2006-05-25 21:04 ` Phil Dibowitz
2006-05-25 21:07 ` David Miller
2006-05-26 9:52 ` Andi Kleen [this message]
2006-05-25 13:34 ` Dave Dillow
2006-05-26 9:46 ` Andi Kleen
2006-05-24 20:10 ` jamal
2006-05-24 20:25 ` Rick Jones
2006-05-25 15:27 ` jamal
2006-05-25 16:43 ` Rick Jones
2006-05-26 22:06 ` Rick Jones
2006-05-24 20:44 ` Brian Haley
2006-05-24 21:01 ` Rick Jones
2006-05-26 6:48 ` Phil Dibowitz
2006-05-24 20:48 ` Phil Dibowitz
2006-05-24 21:04 ` Rick Jones
2006-05-24 21:10 ` Ben Greear
2006-05-25 5:01 ` Phil Dibowitz
2006-05-25 7:18 ` Ben Greear
2006-05-25 7:55 ` Bill Fink
2006-05-25 12:17 ` Francois Romieu
2006-05-25 9:53 ` Pekka Savola
2006-05-24 20:53 ` Andy
2006-05-26 9:43 ` Andi Kleen
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