Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

[Michal Piotrowski]

Hi,

[adding linux-ide to cc]

On 27/06/07, Dan <metalifloyd@gmail.com> wrote:
> Something changed with the AHCI SATA driver in the latest git version.
> With 2.6.21 I get ~49MB/sec according to hdparm. Using the latest git
> version I only get ~8MB/sec. I've attached my .config and have
> included some info about my system below. Please let me know if you
> need more information or if I can help test anything.
>
> Lenovo Thinkpad T60p
>
> kernel information:
> ===================
> Linux lappy 2.6.22-rc5-g75154f40-dirty #1

Are you using any additional patches?

> SMP PREEMPT Sat Jun 23
> 21:14:49 EDT 2007 i686 Genuine Intel(R) CPU T2600 @ 2.16GHz
> GenuineIntel GNU/Linux
>
> Gnu C                  4.1.2
> Gnu make               3.81
> binutils               2.17
> util-linux             2.12r
> mount                  2.12r
> module-init-tools      3.2.2
> e2fsprogs              1.39
> Linux C Library        > libc.2.5
> Dynamic linker (ldd)   2.5
> Procps                 3.2.7
> Net-tools              1.60
> Kbd                    1.12
> Sh-utils               6.9
> udev                   104
> wireless-tools         28
> Modules Loaded         fglrx agpgart af_packet snd_pcm_oss
> snd_mixer_oss ipw3945 ieee80211 ieee80211_crypt snd_hda_intel snd_pcm
> snd_timer snd soundcore snd_page_alloc e1000 psmouse evdev unix
>
>
>
> hdparm -i /dev/sda
> ==================
> /dev/sda:
>
>  Model=HTS721010G9SA00                         , FwRev=MCZIC10V,
> SerialNo=      MPDZN7Y0HKTYZL
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
>  BuffType=DualPortCache, BuffSize=7538kB, MaxMultSect=16, MultSect=?16?
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=195371568
>  IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes:  pio0 pio1 pio2 pio3 pio4
>  DMA modes:  mdma0 mdma1 mdma2
>  UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
>  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-7 T13 1532D revision 1:  ATA/ATAPI-2,3,4,5,6,7
>
> cat /proc/modules
> =================
> fglrx 649632 15 - Live 0xf8a90000 (P)
> agpgart 30412 1 fglrx, Live 0xf894e000
> af_packet 23816 2 - Live 0xf893c000
> snd_pcm_oss 40736 0 - Live 0xf88eb000
> snd_mixer_oss 17536 1 snd_pcm_oss, Live 0xf88b4000
> ipw3945 201124 1 - Live 0xf8909000
> ieee80211 33608 1 ipw3945, Live 0xf88e1000
> ieee80211_crypt 8704 1 ieee80211, Live 0xf887d000
> snd_hda_intel 243864 0 - Live 0xf8958000
> snd_pcm 68996 2 snd_pcm_oss,snd_hda_intel, Live 0xf88f7000
> snd_timer 22148 1 snd_pcm, Live 0xf8872000
> snd 45412 5 snd_pcm_oss,snd_mixer_oss,snd_hda_intel,snd_pcm,snd_timer,
> Live 0xf8881000
> soundcore 10208 1 snd, Live 0xf885a000
> snd_page_alloc 11400 2 snd_hda_intel,snd_pcm, Live 0xf884b000
> e1000 118080 0 - Live 0xf8896000
> psmouse 38416 0 - Live 0xf8867000
> evdev 11648 0 - Live 0xf8847000
> unix 29584 62 - Live 0xf8851000
>
>

Regards,
Michal

-- 
LOG
http://www.stardust.webpages.pl/log/

Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

[Andrew Morton]

On Wed, 27 Jun 2007 00:17:24 -0400 Dan <metalifloyd@gmail.com> wrote:

> Something changed with the AHCI SATA driver in the latest git version.
> With 2.6.21 I get ~49MB/sec according to hdparm. Using the latest git
> version I only get ~8MB/sec. I've attached my .config and have
> included some info about my system below. Please let me know if you
> need more information or if I can help test anything.
> 
> Lenovo Thinkpad T60p

Until we know how widespread this damage is, we'd need to consider this
a blocking bug.

Are you able (as a matter of some urgency) to run a git bisection 
search to identify the offending commit?

Thanks.

Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

[Dan]

> Are you able (as a matter of some urgency) to run a git bisection
> search to identify the offending commit?

For some reason I am no longer able to reproduce the problem. I've
tried several versions including the one I reported and I just can't
reproduce the problem. I accidentally overwrote the original kernel
that had the problem. The weird thing is even when I reset the git
tree to 2.6.22-rc5-g75154f40 and build it, the error is gone.

I've tested with the latest git and all seems well so far. I'll keep a
close eye out and will try to run bisect to find the problem. Sorry, I
should have done that in the first place (Didn't know about it).


-Dan

Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

[Ray Lee]

On 7/1/07, Dan <metalifloyd@gmail.com> wrote:
> > Are you able (as a matter of some urgency) to run a git bisection
> > search to identify the offending commit?
>
> For some reason I am no longer able to reproduce the problem. I've
> tried several versions including the one I reported and I just can't
> reproduce the problem. I accidentally overwrote the original kernel
> that had the problem. The weird thing is even when I reset the git
> tree to 2.6.22-rc5-g75154f40 and build it, the error is gone.

But that isn't the kernel you reported the error against. You reported
that 2.6.22-rc5-g75154f40-*dirty* had the error, which means there was
a diff between what you were building and what was in the repository.
If you know what the diff was and it was something trivial, then you
can disregard this bit of pedantry, but if not, try to recall if you
had something else patched against that.

Regardless, as it's not reproducible it sounds like the report should
be closed...

Re: PROBLEM: SATA AHCI driver significant throughput loss in 2.6.22-rc5-g75154f40-dirty

[Tejun Heo]

Michal Piotrowski wrote:
> Hi,
> 
> [adding linux-ide to cc]
> 
> On 27/06/07, Dan <metalifloyd@gmail.com> wrote:
>> Something changed with the AHCI SATA driver in the latest git version.
>> With 2.6.21 I get ~49MB/sec according to hdparm. Using the latest git
>> version I only get ~8MB/sec. I've attached my .config and have
>> included some info about my system below. Please let me know if you
>> need more information or if I can help test anything.

Please post boot dmesgs of before and after.

-- 
tejun