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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/



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