From: Andrew Morton <akpm@osdl.org>
To: markw@osdl.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.4-mm2
Date: Thu, 18 Mar 2004 10:06:15 -0800 [thread overview]
Message-ID: <20040318100615.7f2943ea.akpm@osdl.org> (raw)
In-Reply-To: <200403181737.i2IHbCE09261@mail.osdl.org>
markw@osdl.org wrote:
>
> Sorry I'm falling behind... I see about a 10% decrease in throughput
> with our dbt2 workload when comparing 2.6.4-mm2 to 2.6.3. I'm wondering
> if this might be a result of the changes to the pagecache, radix-tree
> and writeback code since you mentioned it could affect i/o scheduling in
> 2.6.4-mm1.
Could be. Have you run tests without LVM in the picture?
> PostgreSQL is using 8KB blocks and the characteristics of the i/o should
> be that one lvm2 volume is experiencing mostly sequential writes, while
> another has random reading and writing. Both these volumes are using
> ext2. I'll summarize the throughput results here, with the lvm2 stripe
> width varying across the columns:
>
> kernel 16 kb 32 kb 64 kb 128 kb 256 kb 512 kb
> 2.6.3 2308 2335 2348 2334
> 2.6.4-mm2 2028 2048 2074 2096 2082 2078
>
> Here's a page with links to profile, oprofile, etc of each result:
> http://developer.osdl.org/markw/linux/2.6-pagecache.html
>
> Comparing one pair of readprofile results, I find it curious that
> dm_table_unplug_all and dm_table_any_congested show up near the top of a
> 2.6.4-mm2 profile when they haven't shown up before in 2.6.3.
14015190 poll_idle 241641.2069
175162 generic_unplug_device 1317.0075
165480 __copy_from_user_ll 1272.9231
161151 __copy_to_user_ll 1342.9250
152106 schedule 85.0705
142395 DAC960_LP_InterruptHandler 761.4706
113677 dm_table_unplug_all 1386.3049
65420 __make_request 45.5571
64832 dm_table_any_congested 697.1183
37913 try_to_wake_up 32.2939
That's broken. How many disks are involve in the DM stack?
The relevant code was reworked subsequent to 2.6.4-mm2. Maybe we fixed
this, but I cannot immediately explain what you're seeing here.
next prev parent reply other threads:[~2004-03-18 18:06 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-15 1:28 2.6.4-mm2 Andrew Morton
2004-03-15 1:57 ` 2.6.4-mm2 Joshua Kwan
2004-03-15 6:08 ` 2.6.4-mm2 Sam Ravnborg
2004-03-15 9:32 ` [patch] 2.6.4-mm2: ALSA au88x0.c doesn't compile with gcc 2.95 Adrian Bunk
2004-03-15 9:36 ` 2.6.4-mm2: ALSA au88{1,2}0: multiply defined symbols Adrian Bunk
2004-03-15 18:54 ` 2.6.4-mm2 Sam Ravnborg
2004-03-20 22:50 ` 2.6.4-mm2 Olaf Hering
2004-03-15 19:18 ` 2.6.4-mm2 (compile stats) John Cherry
2004-03-15 20:57 ` 2.6.4-mm2 Thomas Schlichter
2004-03-15 21:08 ` 2.6.4-mm2 Thomas Schlichter
2004-03-15 21:18 ` 2.6.4-mm2 Andrew Morton
2004-03-15 21:18 ` 2.6.4-mm2 Jens Axboe
2004-03-15 22:40 ` 2.6.4-mm2 Thomas Schlichter
2004-03-15 22:11 ` 2.6.4-mm2 Jesse Barnes
2004-03-16 18:32 ` 2.6.4-mm2 Daniel McNeil
2004-03-16 21:58 ` 2.6.4-mm2 Chris Mason
2004-03-16 23:21 ` 2.6.4-mm2 Andrew Morton
2004-03-16 23:28 ` 2.6.4-mm2 Andrew Morton
2004-03-16 23:39 ` 2.6.4-mm2 Andrew Morton
2004-03-17 0:10 ` 2.6.4-mm2 Daniel McNeil
[not found] ` <1079485055.4181.1115.camel@watt.suse.com>
[not found] ` <1079487710.3100.22.camel@ibm-c.pdx.osdl.net>
[not found] ` <20040316180043.441e8150.akpm@osdl.org>
2004-03-17 20:11 ` 2.6.4-mm2 Chris Mason
2004-03-17 20:33 ` 2.6.4-mm2 Andrew Morton
2004-03-17 22:46 ` 2.6.4-mm2 Chris Mason
2004-03-17 23:09 ` 2.6.4-mm2 Andrew Morton
2004-03-17 23:27 ` 2.6.4-mm2 Chris Mason
2004-03-17 23:51 ` 2.6.4-mm2 Andrew Morton
2004-03-18 0:06 ` 2.6.4-mm2 Chris Mason
2004-03-18 0:13 ` 2.6.4-mm2 Andrew Morton
2004-03-18 0:31 ` 2.6.4-mm2 Chris Mason
2004-03-18 0:33 ` 2.6.4-mm2 Andrew Morton
2004-03-18 0:41 ` 2.6.4-mm2 Chris Mason
2004-03-18 1:15 ` 2.6.4-mm2 Daniel McNeil
2004-03-18 17:53 ` 2.6.4-mm2 Daniel McNeil
2004-03-18 18:47 ` 2.6.4-mm2 Chris Mason
2004-03-18 19:10 ` 2.6.4-mm2 Daniel McNeil
2004-03-19 16:49 ` 2.6.5-rc2-mm2 and direct_read_under Daniel McNeil
2004-03-19 17:05 ` 2.6.5-rc1-mm2 " Daniel McNeil
2004-03-21 14:36 ` Chris Mason
2004-03-22 18:10 ` 2.6.5-rc1-mm2 and direct_read_under and wb Daniel McNeil
2004-03-22 18:23 ` Chris Mason
2004-03-22 18:27 ` Chris Mason
2004-03-22 18:35 ` Chris Mason
2004-03-22 18:51 ` Daniel McNeil
2004-03-22 23:13 ` Andrew Morton
2004-03-23 0:51 ` Daniel McNeil
2004-03-23 9:25 ` Andrew Morton
2004-03-23 17:05 ` Daniel McNeil
2004-03-23 17:59 ` Andrew Morton
2004-03-23 21:38 ` Daniel McNeil
2004-03-23 21:47 ` Andrew Morton
2004-03-18 17:37 ` 2.6.4-mm2 markw
2004-03-18 18:06 ` Andrew Morton [this message]
2004-03-18 18:48 ` 2.6.4-mm2 markw
2004-03-18 19:10 ` 2.6.4-mm2 Chris Mason
2004-03-18 19:27 ` 2.6.4-mm2 Jens Axboe
2004-03-18 23:38 ` 2.6.4-mm2 markw
2004-03-19 7:39 ` 2.6.4-mm2 Jens Axboe
2004-03-19 3:15 ` 2.6.4-mm2 Andrew Morton
2004-03-19 7:39 ` 2.6.4-mm2 Jens Axboe
2004-03-19 7:52 ` 2.6.4-mm2 Andrew Morton
2004-03-19 7:57 ` 2.6.4-mm2 Jens Axboe
2004-03-19 8:19 ` 2.6.4-mm2 Andrew Morton
2004-03-19 8:31 ` 2.6.4-mm2 Jens Axboe
2004-03-19 8:39 ` 2.6.4-mm2 Andrew Morton
2004-03-19 8:48 ` 2.6.4-mm2 Jens Axboe
2004-03-19 9:56 ` 2.6.4-mm2 Miquel van Smoorenburg
2004-03-19 10:00 ` 2.6.4-mm2 Jens Axboe
[not found] ` <20040318194150.4de65049.akpm@osdl.org>
2004-03-20 2:39 ` 2.6.4-mm2 Mark Wong
2004-03-20 2:47 ` 2.6.4-mm2 Mark Wong
2004-03-20 2:50 ` 2.6.4-mm2 Andrew Morton
2004-03-20 2:53 ` 2.6.4-mm2 Mark Wong
2004-03-20 3:52 ` 2.6.4-mm2 Nick Piggin
2004-03-20 4:14 ` 2.6.4-mm2 Andrew Morton
2004-03-20 4:24 ` 2.6.4-mm2 Nick Piggin
2004-03-20 4:26 ` 2.6.4-mm2 Nick Piggin
2004-03-20 21:17 ` 2.6.4-mm2 Martin J. Bligh
2004-03-22 17:19 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-23 0:27 ` 2.6.4-mm2 Andrew Morton
2004-03-23 19:21 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-23 19:32 ` 2.6.4-mm2 Andrew Morton
2004-03-24 0:07 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-30 21:30 ` 2.6.4-mm2 Mary Edie Meredith
[not found] <A6974D8E5F98D511BB910002A50A6647615F5E26@hdsmsx402.hd.intel.com>
2004-03-20 4:19 ` 2.6.4-mm2 Len Brown
2004-03-20 4:26 ` 2.6.4-mm2 Andrew Morton
2004-03-20 4:32 ` 2.6.4-mm2 Mark Wong
[not found] <A6974D8E5F98D511BB910002A50A6647615F5E2B@hdsmsx402.hd.intel.com>
2004-03-20 4:27 ` 2.6.4-mm2 Len Brown
2004-03-20 9:01 ` 2.6.4-mm2 Nick Piggin
2004-03-22 16:24 ` 2.6.4-mm2 markw
-- strict thread matches above, loose matches on Subject: below --
2004-03-20 23:12 2.6.4-mm2 sam
2004-03-20 23:41 ` 2.6.4-mm2 Olaf Hering
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