Messages in this thread | | | Date | Wed, 14 Feb 2001 21:28:09 +0000 | From | Eugene Danilchenko <> | Subject | Re: Bug in 2.4.x?? |
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Hello
the same behavior I have :
[root@localhost eugene]# uname -a Linux localhost.localdomain 2.4.1 #1 Пнд Фев 12 23:19:20 /etc/localtime 2001 i686 unknown [root@localhost eugene]# hdparm -i /dev/hdb
/dev/hdb:
Model=ST38410A, FwRev=3.32, SerialNo=7EG23EXT Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=512kB, MaxMultSect=32, MultSect=32 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 udma3 udma4 [root@localhost eugene]# hdparm /dev/hdb /dev/hdb: multcount = 32 (on) I/O support = 1 (32-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) nowerr = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 1048/255/63, sectors = 16841664, start = 0 [root@localhost eugene]# hdparm -t /dev/hdb /dev/hdb: Timing buffered disk reads: 64 MB in 8.00 seconds = 8.00 MB/sec
On Wed, 14 Feb 2001 09:38:18 +0530 Ashwin D <ashwinds@yahoo.com> (by way of Ashwin D <ashwinds@yahoo.com>) wrote:
ADAYCBWOAD> Hi ADAYCBWOAD> ADAYCBWOAD> Well, it may not be a bug, but it sure is bugging me - i have been on this ADAYCBWOAD> for more than a week. Well, here goes; ADAYCBWOAD> ADAYCBWOAD> Why is it that my DMA performance under the kernel 2.4.x is worse than the ADAYCBWOAD> one under 2.2? I have attached the stats below the mail- information and test ADAYCBWOAD> results under both kernels. ADAYCBWOAD> ADAYCBWOAD> I use the following option under rc.local to set dma ; ADAYCBWOAD> ════════ /sbin/hdparm -c1 -d1 -m16 -X66 /dev/hda ADAYCBWOAD> ADAYCBWOAD> I use resierfs, Iam disappointed that 2.4 results are about 1/3rd and need to ADAYCBWOAD> know what to do. ADAYCBWOAD> ADAYCBWOAD> I use a i810 mobo and seagate 8.4 gb hdd ADAYCBWOAD> ADAYCBWOAD> I have tried recompiling the kernel - iam informed a broken .config could ADAYCBWOAD> have caused this, but no change. ADAYCBWOAD> I have tried random settings with hdparm to tune /dev/hda. ADAYCBWOAD> ADAYCBWOAD> Thanks for your time. ADAYCBWOAD> Ashwin ADAYCBWOAD> (Iam not on the list yet, so please cc me personally) ADAYCBWOAD> ADAYCBWOAD> ------------------------- ADAYCBWOAD> TEST RESULTS ADAYCBWOAD> ___________________________ ADAYCBWOAD> ADAYCBWOAD> a) Kernel 2.2.17 (mandrake) ADAYCBWOAD> ADAYCBWOAD> (i) hdpartm -i: ADAYCBWOAD> /dev/hda: ADAYCBWOAD> ADAYCBWOAD> ═Model=ST38420A, FwRev=3.07, SerialNo=7AZ0PTZT ADAYCBWOAD> ═Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } ADAYCBWOAD> ═RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 ADAYCBWOAD> ═BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=16 ADAYCBWOAD> ═CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=16841664 ADAYCBWOAD> ═IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} ADAYCBWOAD> ═PIO modes: pio0 pio1 pio2 pio3 pio4 ADAYCBWOAD> ═DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 ADAYCBWOAD> ADAYCBWOAD> (ii) hdpartm -t: ADAYCBWOAD> /dev/hda: ADAYCBWOAD> ═Timing buffered disk reads: ═64 MB in ═4.38 seconds = 14.61 MB/sec ADAYCBWOAD> ADAYCBWOAD> ADAYCBWOAD> b) Kernel 2.4.1 (linux ) ADAYCBWOAD> ADAYCBWOAD> (i) hdparm -i ADAYCBWOAD> /dev/hda: ADAYCBWOAD> ADAYCBWOAD> ═Model=ST38420A, FwRev=3.07, SerialNo=7AZ0PTZT ADAYCBWOAD> ═Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } ADAYCBWOAD> ═RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 ADAYCBWOAD> ═BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=16 ADAYCBWOAD> ═CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=16841664 ADAYCBWOAD> ═IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} ADAYCBWOAD> ═PIO modes: pio0 pio1 pio2 pio3 pio4 ADAYCBWOAD> ═DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 ADAYCBWOAD> ADAYCBWOAD> (ii) hdparm -t ADAYCBWOAD> ADAYCBWOAD> /dev/hda: ADAYCBWOAD> ═Timing buffered disk reads: ═64 MB in 11.61 seconds = ═5.51 MB/sec ADAYCBWOAD> - ADAYCBWOAD> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in ADAYCBWOAD> the body of a message to majordomo@vger.kernel.org ADAYCBWOAD> More majordomo info at http://vger.kernel.org/majordomo-info.html ADAYCBWOAD> Please read the FAQ at http://www.tux.org/lkml/
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