From: Rusty Russell <rusty@rustcorp.com.au>
To: Ravikiran G Thirumalai <kiran@in.ibm.com>
Cc: linux-kernel@vger.kernel.org, torvalds@transmeta.com
Subject: Re: Patch 2.5.25: Ensure xtime_lock and timerlist_lock are on difft cachelines
Date: Fri, 26 Jul 2002 16:24:51 +1000 [thread overview]
Message-ID: <20020726063124.5114E45D6@lists.samba.org> (raw)
In-Reply-To: Your message of "Thu, 25 Jul 2002 20:45:12 +0530." <20020725204512.E3594@in.ibm.com>
In message <20020725204512.E3594@in.ibm.com> you write:
> I've noticed that xtime_lock and timerlist_lock ends up on the same
> cacheline all the time (atleaset on x86). Not a good thing for
> loads with high xxx_timer and do_gettimeofday counts I guess (networking etc)
..
Better might be to use the x86-64 trick of using sequence counters
around do_gettimeofday, and avoid the xtime lock altogether. That
will improve gettimeofday performance as well. Or you could try
changing xtime lock to a brlock.
FYI: as policy, I don't take optimization patches without
measurements. I'm just not that smart.
Thanks,
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
next prev parent reply other threads:[~2002-07-26 6:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-25 15:15 Patch 2.5.25: Ensure xtime_lock and timerlist_lock are on difft cachelines Ravikiran G Thirumalai
2002-07-26 6:24 ` Rusty Russell [this message]
2002-07-26 7:26 ` Kiran
2002-07-26 7:56 ` Rusty Russell
2002-07-26 9:23 ` Kiran
2002-07-27 4:17 ` Rusty Russell
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