Re: 2.6.1-rc1 [resend]
From: Paolo Ornati (ornati_at_lycos.it)
Date: 12/31/03
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To: linux-kernel@vger.kernel.org Date: Wed, 31 Dec 2003 16:00:07 +0100
PS = sorry if more than one copy of this message appears on lkml but I'm
having some problems with my SMTP server....
On Wednesday 31 December 2003 09:36, Linus Torvalds wrote:
> Ok, I've merged a lot of pending patches into 2.6.1-rc1, and will now
> calm down for a while again, to make sure that the final 2.6.1 is ok.
>
> Most of the updates is for stuff that has been in -mm for a long while
> and is stable, along with driver updates (SCSI, network, i2c and USB).
>
> Linus
>
> ----
With 2.6.1-rc1 I have noticed a strange IDE performance change.
Results of "hdparm -t /dev/hda" with 2.6.0 kernel:
(readahead = 256): ~26.31 MB/s
(readahead = 128): ~31.82 MB/s
PS = readahead is set to 256 by default on my system, 128 seems to be the
best value
Results of "hdparm -t /dev/hda" with 2.6.1-rc1 kernel:
(readahead = 256): ~26.41 MB/s
(readahead = 128): ~26.27 MB/s
Setting readahead to 128 doesn't have the same effect with the new kernel...
INFO on my HD:
/dev/hda:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 128 (on)
geometry = 38792/16/63, sectors = 39102336, start = 0
/dev/hda:
Model=WDC WD200BB-53AUA1, FwRev=18.20D18, SerialNo=WD-WMA6Y1501425
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=39102336
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=no WriteCache=enabled
Drive conforms to: device does not report version: 1 2 3 4 5
IDE controller:
00:04.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus
Master IDE (rev 10) (prog-if 8a
[Master SecP PriP])
Flags: bus master, medium devsel, latency 32
I/O ports at b800 [size=16]
Capabilities: [c0] Power Management version 2
I don't understand how this happens... the only changes to IDE driver seems
to be these:
>
> Summary of changes from v2.6.0 to v2.6.1-rc1
> ============================================
> Andrew Morton:
> o Can't disable IDE DMA
> o IDE MMIO fix
> o IDE capability elevation fix
>
> Linus Torvalds:
> o Make IDE DRQ and READY timeouts longer
For my tests I have used this stupid shell script:
#!/bin/bash
echo "HD test for linux `uname -r`"
echo
ra=8
for i in `seq 12`; do
echo "READAHEAD = $ra";
hdparm -a $ra /dev/hda;
for j in `seq 3`; do
hdparm -t /dev/hda;
done;
ra=$(($ra*2));
done
Results for 2.6.0 && 2.6.1-rc1 are attached.
Bye
-- Paolo Ornati Linux v2.6.0
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