Messages in this thread | | | From | Paolo Ornati <> | Subject | Strange IDE performance change in 2.6.1-rc1 (again) | Date | Fri, 2 Jan 2004 17:02:57 +0100 |
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As I have already said I have noticed a strange IDE performance change upgrading from 2.6.0 to 2.6.1-rc1.
Now I have more data (and a graph) to show: the test is done using "hdparm -t dev/hda" at various readahead (form 0 to 512).
o SCRIPT
#!/bin/bash
MIN=0 MAX=512
ra=$MIN while test $ra -le $MAX; do hdparm -a $ra /dev/hda > /dev/null; echo -n $ra$'\t'; s1=`hdparm -t /dev/hda | grep 'Timing' | cut -d'=' -f2| cut -d' ' -f2`; s2=`hdparm -t /dev/hda | grep 'Timing' | cut -d'=' -f2| cut -d' ' -f2`; s=`echo "scale=2; ($s1+$s2)/2" | bc`; echo $s; ra=$(($ra+16)); done
o RESULTS for 2.6.0 (readahead / speed)
0 13.30 16 13.52 32 13.76 48 31.81 64 31.83 80 31.90 96 31.86 112 31.82 128 31.89 144 31.93 160 31.89 176 31.86 192 31.93 208 31.91 224 31.87 240 31.18 256 26.41 272 27.52 288 31.74 304 27.29 320 27.23 336 25.44 352 27.59 368 27.32 384 31.84 400 28.03 416 28.07 432 20.46 448 28.59 464 28.63 480 23.95 496 27.21 512 22.38
o RESULTS for 2.6.1-rc1 (readahead / speed)
0 13.34 16 25.86 32 26.27 48 24.81 64 26.26 80 24.88 96 27.09 112 24.88 128 26.31 144 24.79 160 26.31 176 24.51 192 25.86 208 24.35 224 26.48 240 24.82 256 26.38 272 24.60 288 31.15 304 24.61 320 26.69 336 24.54 352 26.23 368 24.87 384 25.91 400 25.74 416 26.45 432 23.61 448 26.44 464 24.36 480 26.80 496 24.60 512 26.49
The graph is attached. (x = readahead && y = MB/s)
The kernel config for 2.6.0 is attached (for 2.6.1-rc1 I have just used "make oldconfig").
INFO on my HD:
/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
INFO on my IDE controller:
00:04.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus Master IDE (rev 10)
Comments are welcomed.
Bye,
-- Paolo Ornati Linux v2.4.23
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