From: "Mike Black" <mblack@csihq.com>
To: "Linus Torvalds" <torvalds@transmeta.com>,
"Ben LaHaise" <bcrl@redhat.com>
Cc: "Daniel Phillips" <phillips@bonn-fries.net>,
"Rik van Riel" <riel@conectiva.com.br>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
"Andrew Morton" <andrewm@uow.edu.au>
Subject: Re: [RFC][DATA] re "ongoing vm suckage"
Date: Sat, 4 Aug 2001 10:22:19 -0400 [thread overview]
Message-ID: <028001c11cf0$e5becca0$b6562341@cfl.rr.com> (raw)
In-Reply-To: <Pine.LNX.4.33.0108032330450.1193-100000@penguin.transmeta.com>
I'm testing 2.4.8-pre4 -- MUCH better interactivity behavior now.
I've been testing ext3/raid5 for several weeks now and this is usable now.
My system is Dual 1Ghz/2GRam/4GSwap fibrechannel.
But...the single thread i/o performance is down.
Previously I was getting about 60MB/sec on one thread for Seq Read -- now
it's 40MB/sec.
Here's the run:
tiobench.pl --size 4000
Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/secd . -T
File Block Num Seq Read Rand Read Seq Write Rand Write
Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%)
------- ------ ------- --- ----------- ----------- ----------- -----------
. 4000 4096 1 40.62 73.8% 0.675 1.38% 27.08 43.6% 1.207 2.00%
. 4000 4096 2 17.02 30.2% 0.761 1.63% 16.84 29.9% 1.270 1.78%
. 4000 4096 4 14.96 26.8% 0.885 2.13% 13.75 31.2% 1.278 1.69%
. 4000 4096 8 13.39 21.5% 0.952 2.48% 12.46 33.2% 1.188 1.48%
During the 4-thread run there was one long pause (instead of being totally
unusable before with even 2 threads).
Didn't notice any pauses during 8 threads.
I"m seeing a lot more CPU Usage for the 1st thread than previous tests --
perhaps we've shortened the queue too much and it's throttling the read?
Why would CPU usage go up and I/O go down?
Here's a previous test (only 1 thread as 2 threads became unusable).
File Block Num Seq Read Rand Read Seq Write Rand Write
Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%)
------- ------ ------- --- ----------- ----------- ----------- -----------
. 4000 4096 1 66.69 53.6% 0.829 1.43% 27.64 41.6% 1.287 0.74%
----- Original Message -----
From: "Linus Torvalds" <torvalds@transmeta.com>
To: "Ben LaHaise" <bcrl@redhat.com>
Cc: "Daniel Phillips" <phillips@bonn-fries.net>; "Rik van Riel"
<riel@conectiva.com.br>; <linux-kernel@vger.kernel.org>;
<linux-mm@kvack.org>
Sent: Saturday, August 04, 2001 2:37 AM
Subject: Re: [RFC][DATA] re "ongoing vm suckage"
>
> Well, I've made a 2.4.8-pre4.
>
> This one has marcelo's zone fixes, and my request suggestions. I'm writing
> email right now with the 8GB write in the background, and unpacked and
> patched a kernel. It's certainly not _fast_, but it's not too painful to
> use either. The 8GB file took 7:25 to write (including the sync), which
> averages out to 18+MB/s. Which is, as far as I can tell, about the best I
> can get on this 5400RPM 80GB drive with the current IDE driver (the
> experimental IDE driver is supposed to do better, but that's not for
> 2.4.x)
>
next prev parent reply other threads:[~2001-08-04 14:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-03 23:44 [RFC][DATA] re "ongoing vm suckage" Ben LaHaise
2001-08-04 1:29 ` Rik van Riel
2001-08-04 3:06 ` Daniel Phillips
2001-08-04 3:13 ` Linus Torvalds
2001-08-04 3:23 ` Rik van Riel
2001-08-04 3:35 ` Linus Torvalds
2001-08-04 3:26 ` Ben LaHaise
2001-08-04 3:34 ` Rik van Riel
2001-08-04 3:38 ` Linus Torvalds
2001-08-04 3:48 ` Linus Torvalds
2001-08-04 4:14 ` Ben LaHaise
2001-08-04 4:20 ` Linus Torvalds
2001-08-04 4:39 ` Ben LaHaise
2001-08-04 4:47 ` Linus Torvalds
2001-08-04 5:13 ` Ben LaHaise
2001-08-04 5:28 ` Linus Torvalds
2001-08-04 6:37 ` Linus Torvalds
2001-08-04 5:38 ` Marcelo Tosatti
2001-08-04 7:13 ` Rik van Riel
2001-08-04 14:22 ` Mike Black [this message]
2001-08-04 17:08 ` Linus Torvalds
2001-08-05 4:19 ` Michael Rothwell
2001-08-05 18:40 ` Marcelo Tosatti
2001-08-05 20:20 ` Linus Torvalds
2001-08-05 20:45 ` arjan
2001-08-06 20:32 ` Rob Landley
2001-08-05 15:24 ` Mike Black
2001-08-05 20:04 ` Linus Torvalds
2001-08-05 20:23 ` Alan Cox
2001-08-05 20:33 ` Linus Torvalds
2001-08-04 16:21 ` Mark Hemment
2001-08-07 15:45 ` Ben LaHaise
2001-08-07 16:22 ` Linus Torvalds
2001-08-07 16:51 ` Ben LaHaise
2001-08-07 17:08 ` Linus Torvalds
2001-08-07 18:17 ` Andrew Morton
2001-08-07 18:40 ` Ben LaHaise
2001-08-07 21:33 ` Daniel Phillips
2001-08-07 22:03 ` Linus Torvalds
2001-08-07 21:33 ` Linus Torvalds
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