Very slow SCSI throughput on Indy R4600
Hi,
I've been trying several 2.4 debian kernels on my Indy (R4600), but I
still experience very slow SCSI throughput:
/dev/sda3:
Timing buffered disk reads: 8 MB in 3.42 seconds = 2.34 MB/sec
Anything takes hours to complete on that box. I have another Indy (with
the exact same HD btw) running IRIX and it feels much more reactive.
Both boxes have 128M RAM
I googled and found nothing relevant so I'm asking around if someone
else have seen this before and if there's a fix.
I'm trying to rebuild a 2.6 cvs kernel to see if that corrects the
problem (first attempt led me to a "no init found" error).
Here's the box cpuinfo:
system type : SGI Indy
processor : 0
cpu model : R4600 V1.0 FPU V0.0
BogoMIPS : 99.73
byteorder : big endian
wait instruction : yes
microsecond timers : yes
tlb_entries : 48
extra interrupt vector : no
hardware watchpoint : no
VCED exceptions : not available
VCEI exceptions : not available
and the dmesg excerpt:
SCSI subsystem driver Revision: 1.00
wd33c93-0: chip=WD33c93B/13 no_sync=0xff no_dma=0 debug_flags=0x00
setup_args=,,,,,,,,,
Version 1.25 - 09/Jul/1997, Compiled May 31 2004 at 00:52:19
scsi0 : SGI WD93
sending SDTR 0103013f0csync_xfer=2c Vendor: IBM Model: DCHS04F
CLAR04 Rev: HP53
Type: Direct-Access ANSI SCSI revision: 02
Attached scsi disk sda at scsi0, channel 0, id 1, lun 0
SCSI device sda: 8888544 512-byte hdwr sectors (4551 MB)
TIA,
Thibaut VARENE
The PA/Linux ESIEE Team
http://www.pateam.org/
Reply to: