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.
-CB
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> results: 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> Yves
YG> _______________________________________________ YG> Linuxbios mailing list YG> Linuxbios@clustermatic.org YG> http://www.clustermatic.org/mailman/listinfo/linuxbios