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SubjectPoor SCSI drive performance on SMP machine, 2.2.16
Date
I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM IBM
10 GB SCSI drive
(AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives. The
SCSI drive
performs the worst. In tests of writing 100 MB and sync'ing, one of my IDE
drives takes 31 seconds. The SCSI drive (while doing nothing else) took
2 minutes, 10 seconds. This is extremely noticable in file transfers that
completely
monopolize the SCSI drive, and are much slower than when involving the IDE
drives.
After a large data operation on the SCSI drive, the system will hang for
several minutes.
Anyone know what could be causing this? Thanks.

Attached are some data to help.


Thanks,
Para-dox (paradox3@maine.rr.com)

CPU0 CPU1
0: 43661720 59171710 IO-APIC-edge timer
1: 233992 282694 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
13: 1 0 XT-PIC fpu
14: 20 10 IO-APIC-edge ide0
15: 46455293 50354306 IO-APIC-edge ide1
16: 14508949 14462778 IO-APIC-level eth0
17: 3939554 4293901 IO-APIC-level eth1
18: 750747 761816 IO-APIC-level aic7xxx
NMI: 0
ERR: 0
PCI devices found:
Bus 0, device 0, function 0:
Host bridge: Intel 440BX - 82443BX Host (rev 2).
Medium devsel. Master Capable. Latency=64.
Prefetchable 32 bit memory at 0xe8000000 [0xe8000008].
Bus 0, device 1, function 0:
PCI bridge: Intel 440BX - 82443BX AGP (rev 2).
Medium devsel. Master Capable. Latency=64. Min Gnt=136.
Bus 0, device 7, function 0:
ISA bridge: Intel 82371AB PIIX4 ISA (rev 2).
Medium devsel. Fast back-to-back capable. Master Capable. No bursts.
Bus 0, device 7, function 1:
IDE interface: Intel 82371AB PIIX4 IDE (rev 1).
Medium devsel. Fast back-to-back capable. Master Capable. Latency=64.
I/O at 0xf000 [0xf001].
Bus 0, device 7, function 2:
USB Controller: Intel 82371AB PIIX4 USB (rev 1).
Medium devsel. Fast back-to-back capable. IRQ 10. Master Capable. Latency=64.
I/O at 0xe000 [0xe001].
Bus 0, device 7, function 3:
Bridge: Intel 82371AB PIIX4 ACPI (rev 2).
Medium devsel. Fast back-to-back capable.
Bus 0, device 8, function 0:
Ethernet controller: Intel 82557 (rev 5).
Medium devsel. Fast back-to-back capable. IRQ 16. Master Capable. Latency=64. Min Gnt=8.Max Lat=56.
Prefetchable 32 bit memory at 0xef101000 [0xef101008].
I/O at 0xe400 [0xe401].
Non-prefetchable 32 bit memory at 0xef000000 [0xef000000].
Bus 0, device 9, function 0:
Ethernet controller: Winbond NE2000-PCI (rev 0).
Medium devsel. Fast back-to-back capable. IRQ 17.
I/O at 0xe800 [0xe801].
Bus 0, device 12, function 0:
SCSI storage controller: Adaptec AIC-7890/1 (rev 0).
Medium devsel. Fast back-to-back capable. BIST capable. IRQ 18. Master Capable. Latency=64. Min Gnt=39.Max Lat=25.
I/O at 0xec00 [0xec01].
Non-prefetchable 64 bit memory at 0xef100000 [0xef100004].
Bus 1, device 0, function 0:
VGA compatible controller: S3 Inc. ViRGE/GX2 (rev 6).
Medium devsel. IRQ 16. Master Capable. Latency=64. Min Gnt=4.Max Lat=255.
Non-prefetchable 32 bit memory at 0xe0000000 [0xe0000000].
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