* Re: IDE performance drop between 2.4.23 and 2.6.0
@ 2003-12-25 16:39 Max Payne
2003-12-25 18:25 ` Jean-Luc Fontaine
0 siblings, 1 reply; 3+ messages in thread
From: Max Payne @ 2003-12-25 16:39 UTC (permalink / raw)
To: jfontain; +Cc: linux-kernel
Hi!
IO scheduler issue? Please try repeating your tests with
'elevator=deadline' at boot.
2003-12-23, k keltezéssel Jean-Luc Fontaine ezt írta:
> Using hdparm -Tt /dev/hdb:
>
> on 2.4:
> Timing buffer-cache reads: 168 MB in 2.01 seconds =
83.58 MB/sec
> Timing buffered disk reads: 44 MB in 3.12 seconds =
14.10 MB/sec
> on 2.6:
> Timing buffer-cache reads: 172 MB in 2.02 seconds =
84.95 MB/sec
> Timing buffered disk reads: 34 MB in 3.08 seconds =
11.04 MB/sec
>
> Note the big drop of of 3 MB/sec on disk reads.
>
> dmesg (edited) gives:
>
> on 2.4:
> VP_IDE: VIA vt82c586b (rev 41) IDE UDMA33 controller on
pci00:07.1
> hdb: IC35L040AVVN07-0, ATA DISK drive
> hdb: 80418240 sectors (41174 MB) w/1863KiB Cache,
CHS=79780/16/63,
> UDMA(33)
> on 2.6:
> VP_IDE: VIA vt82c586b (rev 41) IDE UDMA33 controller on
pci0000:00:07.1
> hdb: IC35L040AVVN07-0, ATA DISK drive
> hdb: 80418240 sectors (41174 MB) w/1863KiB Cache,
CHS=65535/16/63,
> UDMA(33)
>
> hdparm -i output is identical between the 2 kernels and
hdparm settings
> are identical as follows (except cylinders as above):
>
> Model=IC35L040AVVN07-0, FwRev=VA2OAG0A,
SerialNo=VNP210B2RAP0TB
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
> BuffType=DualPortCache, BuffSize=1863kB, MaxMultSect=16,
MultSect=16
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes,
LBAsects=80418240
> IORDY=on/off, tPIO={min:240,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: disabled (255) WriteCache=enabled
> Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:
>
> multcount = 16 (on)
> IO_support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 79780/16/63, sectors = 80418240, start = 0
>
> I noticed a difference in dmesg:
> on 2.4:
> Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
> on 2.6:
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
>
> Could that make a difference?
>
> Please let me know if you'd like me to run more tests,
patch kernels,
> ..., anything to regain the performance.
>
>
> Many thanks in advance,
>
> --
> Jean-Luc Fontaine
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: IDE performance drop between 2.4.23 and 2.6.0
2003-12-25 16:39 IDE performance drop between 2.4.23 and 2.6.0 Max Payne
@ 2003-12-25 18:25 ` Jean-Luc Fontaine
2004-01-10 11:14 ` IDE performance drop between 2.4.23 and 2.6.0: fixed in 2.6.1 Jean-Luc Fontaine
0 siblings, 1 reply; 3+ messages in thread
From: Jean-Luc Fontaine @ 2003-12-25 18:25 UTC (permalink / raw)
To: linux-kernel; +Cc: max..payne
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Max Payne wrote:
| IO scheduler issue? Please try repeating your tests with
| 'elevator=deadline' at boot.
Thank you for your suggestion. I tried it but it made no improvement.
Jean-Luc
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^ permalink raw reply [flat|nested] 3+ messages in thread
* IDE performance drop between 2.4.23 and 2.6.0: fixed in 2.6.1
2003-12-25 18:25 ` Jean-Luc Fontaine
@ 2004-01-10 11:14 ` Jean-Luc Fontaine
0 siblings, 0 replies; 3+ messages in thread
From: Jean-Luc Fontaine @ 2004-01-10 11:14 UTC (permalink / raw)
To: linux-kernel
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Using hdparm -Tt /dev/hdb:
on 2.4:
~ Timing buffer-cache reads: 168 MB in 2.01 seconds = 83.58 MB/sec
~ Timing buffered disk reads: 44 MB in 3.12 seconds = 14.10 MB/sec
on 2.6.0:
~ Timing buffer-cache reads: 172 MB in 2.02 seconds = 84.95 MB/sec
~ Timing buffered disk reads: 34 MB in 3.08 seconds = 11.04 MB/sec
on 2.6.1:
~ Timing buffer-cache reads: 172 MB in 2.01 seconds = 85.14 MB/sec
~ Timing buffered disk reads: 44 MB in 3.07 seconds = 14.35 MB/sec
and that straight after boot, without any tweaking from hdparm.
Great job: many thanks!
- --
Jean-Luc Fontaine
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-12-25 16:39 IDE performance drop between 2.4.23 and 2.6.0 Max Payne
2003-12-25 18:25 ` Jean-Luc Fontaine
2004-01-10 11:14 ` IDE performance drop between 2.4.23 and 2.6.0: fixed in 2.6.1 Jean-Luc Fontaine
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