Low performance of the IDE on the SIS550
christopher at bergeron.com
Thu Oct 3 10:41:01 CEST 2002
Have you tried hdparm /dev/whateverX (or hdparm -t /dev/whateverX)? This will give you a more
accurate result (IMHO) and it will allow you to set the DMA settings
on the drive.
Thursday, October 3, 2002, 8:19:00 AM, you wrote:
YG> Hi everyone,
YG> I have a board based on the SIS550 (Vortex86 @167 MHz) and I wantd to
YG> setup a NFS file server that is capable to sustain 10 MBytes/s. But the
YG> problem is that the IDE interface seems very slow in writing. I patch my
YG> kernel (2.4.19) with the patch for the 5513 and now the controller is
YG> recognise as a ATA-100a but when I try to put the controller un UDMA mode
YG> mode 5, I got a message from hdparm that told that it is not supported.
YG> Anyway, with the UDMA mode 2 I should have the performance that I need. I
YG> look on header of the ide connector and the burst when writing seems to be
YG> quick anough but between each of these bursts I have a hole of 5-6 seconds.
YG> I test the speed with theses commands:
YG> time dd if=/dev/zero of=zero bs=1k count=100k -> WRITING
->> 30 sec
YG> time dd if=zero of=/dev/null bs=1k count=100k -> READING
->> 10 sec
YG> I try all configuration possible (hdparm) for the harddisk and 3 MB/s is
YG> the best result that I got. In PIO mode 4, I only got a 1.5 MB/s !
YG> I performed theses tests on different architecture and I got the following
YG> SC520 PIO (ISA) -> 1.63 MB/s
YG> SC1210 PIO -> 4.54 MB/s -> I was unable to enable the DMA ????
YG> P133 ATA-33 -> 5.50 MB/s
YG> PII-266 ATA-33 -> 17.83 MB/s
YG> PII-400 ATA-33 -> 20.54 MB/s
YG> C3-667 ATA-100 -> 23.05 MB/s
YG> Does anyone have an idea why:
YG> 1. I cannot enable the UDMA mode 5 ?
YG> 2. I only got 3 MBytes/s in writing ?
YG> Thanks !
YG> Linuxbios mailing list
YG> Linuxbios at clustermatic.org
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