Re: disk speed regression kernel 2.6.29 and after

[odie@cs.aau.dk]

(Bart, a commit by you might be involved here, please see below.)

>> I had been using an old 2.6.22 kernel on my machine, and I often backup
>> one partition of my main hard drive to a partition on a second hard
>> drive. The main hard drive is sata 640 gigs, and the second is a pata
>> 320 gig. copying this partition from one drive to the other with dd
>> takes about 3 minutes and 30 seconds. When I installed kernel 2.6.30,
>> and 2.6.31, the time took 9 minutes and 20 seconds. I decided to go to
>> the trouble of compiling all the kernels between, and kernels
>> 2.6.22-2.6.28 all do the operation in about 3 minutes and 30 seconds.
>> 2.6.29- newer all take about 9 minutes and 20 seconds. The partition is
>> 16 gigs. each drive seems to be as fast as before otherwise, it's just
>> much slower copying from one drive to another, which I do very often.
>> This is an nforce 3 based motherboard, amd southbridge, i think, with 4
>> gigs of ram, athlon 64x2. 32 bit kernel. has anyone heard of this problem?
>> I currently have 3 hard drives hooked up.
>> a 200 gig on a promise controller,
>> a 320 gig on the amd pata?
>> a 640 sata on the nv i think.
>> The motherboard is a Asrock-AM2NF3-VSTA
>> copying this partition with dd or cat or schily's dd between any of these 3
>> different hard drives takes different times depending on the speed of
>> the drive with
>> kernels 2.6.22-2.6.28, but takes about 9 minutes and 30 seconds on any
>> of the drives
>> with the kernels 2.6.29 and after.

>> Can you post the dmesg output from bootup on both the good and bad kernels?

So, the good and bad below are a result of a git bisect run?

And did you notice these warnings?

> good
> Linux version 2.6.28-04985-gebdab07 (root@Wil.com) (gcc version  
> 4.4.1 (GCC) ) #14 SMP Wed Sep 23 21:12:50 CDT 2009
[...]

> Freeing unused kernel memory: 284k freed
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: sda5: warning: vs-500: unknown uniqueness -107167201[18060  
> 33348 0xf6c5325c UNKNOWN] not found
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: sda5: warning: vs-500: unknown uniqueness -107167201[18060  
> 113891 0xf6c55758 UNKNOWN] not found
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: sda5: warning: vs-500: unknown uniqueness  
> -107167201[117144 365484 0xf6c56188 UNKNOWN] not found

Hmm, this looks like a reiserfs problem that was present for a while between
2.6.28 and 2.6.29-rc1 [1]. You'd probably like to run fsck.

> ip_tables: (C) 2000-2006 Netfilter Core Team
> hdb: UDMA/33 mode selected
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/dir.c:462 sysfs_add_one+0x3c/0x50()
> Hardware name: To Be Filled By O.E.M.
> sysfs: duplicate filename 'audio' can not be created
> Modules linked in: sound(+) ipt_LOG ip_tables x_tables
> Pid: 1666, comm: modprobe Not tainted 2.6.28-04985-gebdab07 #14
> Call Trace:
>  [<c01406b2>] warn_slowpath+0x82/0xc0
>  [<c050a8fe>] schedule+0x21e/0x780
>  [<c012eb77>] xapic_wait_icr_idle+0x17/0x20
>  [<c035ca84>] idr_get_empty_slot+0xe4/0x260
>  [<c035cc79>] ida_get_new_above+0x79/0x1b0
>  [<c01cfcd0>] sysfs_ilookup_test+0x0/0x10
>  [<c01cfff1>] sysfs_find_dirent+0x21/0x30
>  [<c01d012d>] __sysfs_add_one+0x1d/0xe0
>  [<c019e8a6>] ilookup5+0x36/0x40
>  [<c01d022c>] sysfs_add_one+0x3c/0x50
>  [<c01d07d8>] create_dir+0x48/0x90
>  [<c01d0849>] sysfs_create_dir+0x29/0x40
>  [<c035d75f>] kobject_get+0xf/0x20
>  [<c035d853>] kobject_add_internal+0x83/0x1d0
>  [<c035da2a>] kobject_set_name_vargs+0x3a/0x50
>  [<c035da5e>] kobject_add_varg+0x1e/0x60
>  [<c035dafd>] kobject_add+0x2d/0x60
>  [<c035d75f>] kobject_get+0xf/0x20
>  [<c03c9a0a>] device_add+0xca/0x600
>  [<c035d515>] kobject_init+0x25/0xa0
>  [<c03c9fdb>] device_create_vargs+0x8b/0xd0
>  [<c03ca04b>] device_create+0x2b/0x30
>  [<f85ff0a5>] oss_init+0xa5/0x149 [sound]
>  [<c0101123>] do_one_initcall+0x33/0x170
>  [<f85ff000>] oss_init+0x0/0x149 [sound]
>  [<c016345b>] sys_init_module+0x8b/0x1b0
>  [<c018b688>] sys_close+0x58/0x90
>  [<c011c26e>] syscall_call+0x7/0xb
> ---[ end trace c45370bb6aa94452 ]---
> kobject_add_internal failed for audio with -EEXIST, don't try to  
> register things with the same name in the same directory.
> Pid: 1666, comm: modprobe Tainted: G        W  2.6.28-04985-gebdab07 #14
> Call Trace:
>  [<c035d902>] kobject_add_internal+0x132/0x1d0
>  [<c035dafd>] kobject_add+0x2d/0x60
>  [<c035d75f>] kobject_get+0xf/0x20
>  [<c03c9a0a>] device_add+0xca/0x600
>  [<c035d515>] kobject_init+0x25/0xa0
>  [<c03c9fdb>] device_create_vargs+0x8b/0xd0
>  [<c03ca04b>] device_create+0x2b/0x30
>  [<f85ff0a5>] oss_init+0xa5/0x149 [sound]
>  [<c0101123>] do_one_initcall+0x33/0x170
>  [<f85ff000>] oss_init+0x0/0x149 [sound]
>  [<c016345b>] sys_init_module+0x8b/0x1b0
>  [<c018b688>] sys_close+0x58/0x90
>  [<c011c26e>] syscall_call+0x7/0xb
> hdc: UDMA/33 mode selected
> Driver 'sr' needs updating - please use bus_type methods
> hdd: UDMA/66 mode selected
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: warning: vs-500: unknown uniqueness -1071672013
> ReiserFS: sda5: warning: vs-500: unknown uniqueness  
> -107167201[117144 365494 0xf6ca87d8 UNKNOWN] not found
> w83627ehf: Found W83627EHG chip at 0x290
> warning: process `update' used the obsolete bdflush system call
> Fix your initscripts?
> warning: process `update' used the obsolete bdflush system call
> Fix your initscripts?

These warnings are a consequence of the problem above I believe. I don't
know whether they have affected your bisect run, you should really apply
the patch in [1] and rerun the tests.

>
> bad
>
> Linux version 2.6.28-04986-g295f000 (root@Wil.com) (gcc version  
> 4.4.1 (GCC) ) #13 SMP Wed Sep 23 21:08:03 CDT 2009

So if your bisect is correct, then 295f000
(ide: don't execute the next queued command from the hard-IRQ context (v2))
is faulty.

Bart, any ideas or would you like a rerun with the reiserfs patch in place
by Will?

[1] http://lkml.org/lkml/2009/1/12/471


Simon Holm Thøgersen

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