Messages in this thread | | | From | Ashwin D <>(by way of Ashwin D <>) | Date | Wed, 14 Feb 2001 09:38:18 +0530 | Subject | Bug in 2.4.x?? |
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Hi
Well, it may not be a bug, but it sure is bugging me - i have been on this for more than a week. Well, here goes;
Why is it that my DMA performance under the kernel 2.4.x is worse than the one under 2.2? I have attached the stats below the mail- information and test results under both kernels.
I use the following option under rc.local to set dma ; /sbin/hdparm -c1 -d1 -m16 -X66 /dev/hda
I use resierfs, Iam disappointed that 2.4 results are about 1/3rd and need to know what to do.
I use a i810 mobo and seagate 8.4 gb hdd
I have tried recompiling the kernel - iam informed a broken .config could have caused this, but no change. I have tried random settings with hdparm to tune /dev/hda.
Thanks for your time. Ashwin (Iam not on the list yet, so please cc me personally)
------------------------- TEST RESULTS ___________________________
a) Kernel 2.2.17 (mandrake)
(i) hdpartm -i: /dev/hda:
Model=ST38420A, FwRev=3.07, SerialNo=7AZ0PTZT Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=16841664 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 udma0 udma1 *udma2
(ii) hdpartm -t: /dev/hda: Timing buffered disk reads: 64 MB in 4.38 seconds = 14.61 MB/sec
b) Kernel 2.4.1 (linux )
(i) hdparm -i /dev/hda:
Model=ST38420A, FwRev=3.07, SerialNo=7AZ0PTZT Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=16841664 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 udma0 udma1 *udma2
(ii) hdparm -t
/dev/hda: Timing buffered disk reads: 64 MB in 11.61 seconds = 5.51 MB/sec - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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