Hi everyone, I have a board based on the SIS550 (Vortex86 @167 MHz) and I wantd to setup a NFS file server that is capable to sustain 10 MBytes/s. But the problem is that the IDE interface seems very slow in writing. I patch my kernel (2.4.19) with the patch for the 5513 and now the controller is recognise as a ATA-100a but when I try to put the controller un UDMA mode mode 5, I got a message from hdparm that told that it is not supported.
Anyway, with the UDMA mode 2 I should have the performance that I need. I look on header of the ide connector and the burst when writing seems to be quick anough but between each of these bursts I have a hole of 5-6 seconds.
I test the speed with theses commands:
time dd if=/dev/zero of=zero bs=1k count=100k -> WRITING -> 30 sec
time dd if=zero of=/dev/null bs=1k count=100k -> READING -> 10 sec
I try all configuration possible (hdparm) for the harddisk and 3 MB/s is the best result that I got. In PIO mode 4, I only got a 1.5 MB/s ! I performed theses tests on different architecture and I got the following results: SC520 PIO (ISA) -> 1.63 MB/s SC1210 PIO -> 4.54 MB/s -> I was unable to enable the DMA ???? P133 ATA-33 -> 5.50 MB/s PII-266 ATA-33 -> 17.83 MB/s PII-400 ATA-33 -> 20.54 MB/s C3-667 ATA-100 -> 23.05 MB/s
Does anyone have an idea why: 1. I cannot enable the UDMA mode 5 ? 2. I only got 3 MBytes/s in writing ?
Thanks !
Yves