From: Andi Kleen <ak@suse.de>
To: lvm-devel@sistina.com
Cc: Lance Larsh <llarsh@oracle.com>,
Brian Strand <bstrand@switchmanagement.com>,
linux-kernel@vger.kernel.org
Subject: Re: [lvm-devel] Re: 2x Oracle slowdown from 2.2.16 to 2.4.4
Date: Thu, 12 Jul 2001 11:26:13 +0200 [thread overview]
Message-ID: <20010712112613.A14134@gruyere.muc.suse.de> (raw)
In-Reply-To: <3B4C8263.6000407@switchmanagement.com> <Pine.LNX.4.21.0107111530170.2342-100000@llarsh-pc3.us.oracle.com> <20010712043046.R3496@athlon.random>
In-Reply-To: <20010712043046.R3496@athlon.random>; from andrea@suse.de on Thu, Jul 12, 2001 at 04:30:46AM +0200
On Thu, Jul 12, 2001 at 04:30:46AM +0200, Andrea Arcangeli wrote:
> I will soon somehow make those changes in the lvm (based on beta7) in my
> tree and it will be interesting to see if this will make a difference. I
> will also have a look to see if I can improve a little more the lvm_map
> but other than those non rw semaphores there should be not a significant
> overhead to remove in the lvm fast path.
Even if you fix the snapshot_sem you still have the down on the _pe_lock
in lvm_map. The part covered by the PE lock is only a few tenths of cycles
shorter than the part covered by the snapshot semaphore; so it is unlikely
that you see much difference unless you change both to rwsems.
Wouldn't a single semaphore be enough BTW to cover both?
-Andi
next prev parent reply other threads:[~2001-07-12 9:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-11 0:45 Brian Strand
2001-07-11 1:15 ` Andrea Arcangeli
2001-07-11 16:44 ` Brian Strand
2001-07-11 17:08 ` Andrea Arcangeli
2001-07-11 17:23 ` Chris Mason
2001-07-11 23:03 ` Lance Larsh
2001-07-11 23:46 ` Brian Strand
2001-07-12 15:21 ` Lance Larsh
2001-07-12 21:31 ` Hans Reiser
2001-07-12 21:51 ` Chris Mason
2001-07-13 3:00 ` Andrew Morton
2001-07-13 4:17 ` Andrew Morton
2001-07-13 15:36 ` Jeffrey W. Baker
2001-07-13 15:49 ` Andrew Morton
2001-07-16 22:03 ` Stephen C. Tweedie
2001-07-12 0:23 ` Chris Mason
2001-07-12 14:48 ` Lance Larsh
2001-07-12 2:30 ` Andrea Arcangeli
2001-07-12 9:26 ` Andi Kleen [this message]
2001-07-12 9:45 ` [lvm-devel] " Andrea Arcangeli
2001-07-12 17:04 ` Andreas Dilger
2001-07-12 18:18 ` Andrea Arcangeli
2001-07-12 22:55 ` Andrea Arcangeli
2001-07-13 7:35 ` Andreas Dilger
2001-07-13 16:07 ` Andrea Arcangeli
2001-07-12 6:12 ` parviz dey
2001-07-11 2:58 ` Jeff V. Merkey
2001-07-11 15:55 ` Brian Strand
2001-07-11 2:59 ` Jeff V. Merkey
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