From: Yuri Tikhonov <yur@emcraft.com>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] ppc44x: support for 256K PAGE_SIZE
Date: Fri, 19 Oct 2007 19:37:23 +0400 [thread overview]
Message-ID: <200710191937.23638.yur@emcraft.com> (raw)
In-Reply-To: <18199.60025.563689.10810@cargo.ozlabs.ibm.com>
On Friday 19 October 2007 03:21, Paul Mackerras wrote:
> Have you measured the performance using a 64kB page size? If so, how
> does it compare with the 256kB page size?
I measured the performance of the sequential full-stripe write operations to
a RAID-5 array (P values below are in MB per second) using the h/w accelerated
RAID-5 driver.
Here are the comparative results for the different PAGE_SIZE values:
PAGE_SIZE = 4K:
P = 66 MBps;
PAGE_SIZE = 16K:
P = 145 MBps;
PAGE_SIZE = 64K:
P = 196 MBps;
PAGE_SIZE = 256K:
P = 217 MBps.
> The 64kB page size has the attraction that no binutils changes are
> required.
That's true, but the additional performance is an attractive thing too.
>
> Paul.
>
--
Yuri Tikhonov, Senior Software Engineer
Emcraft Systems, www.emcraft.com
next prev parent reply other threads:[~2007-10-19 15:39 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-18 7:08 [PATCH] ppc44x: support for 256K PAGE_SIZE Yuri Tikhonov
2007-10-18 10:44 ` Josh Boyer
2007-10-18 11:45 ` Benjamin Herrenschmidt
2007-10-18 12:01 ` Josh Boyer
2007-10-18 12:12 ` Benjamin Herrenschmidt
2007-10-18 13:25 ` Yuri Tikhonov
2007-10-23 14:00 ` Segher Boessenkool
2007-10-18 13:18 ` Yuri Tikhonov
2007-10-18 13:25 ` Josh Boyer
2007-10-18 13:30 ` Yuri Tikhonov
2007-10-18 14:41 ` Josh Boyer
2007-10-18 23:21 ` Paul Mackerras
2007-10-19 13:24 ` Kumar Gala
2007-10-22 16:12 ` Yuri Tikhonov
2007-10-23 13:59 ` Segher Boessenkool
2007-10-23 23:08 ` Paul Mackerras
2007-10-23 23:15 ` Paul Mackerras
2007-10-19 15:37 ` Yuri Tikhonov [this message]
2007-10-19 15:48 ` Kumar Gala
2007-10-19 16:03 ` Yuri Tikhonov
2007-10-19 16:36 ` Josh Boyer
2007-10-19 19:04 ` Wolfgang Denk
-- strict thread matches above, loose matches on Subject: below --
2007-10-18 11:00 Yuri Tikhonov
2007-10-18 11:47 ` Benjamin Herrenschmidt
2007-10-18 13:20 ` Yuri Tikhonov
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