[PlanetCCRMA] tuning disks with /dev/sda SCSI drives
Noah Garrett Wallach
logic@enabled.com
Fri Nov 12 11:08:01 2004
On Fri, 12 Nov 2004 09:25:09 -0800, Mark Knecht wrote
> start with hdparm -tT to get some speed info. Look at interrupts
> also. cat /proc/interrupts and cat /proc/irq/...
>
Mark,
Okay the CCRMA documentation appears to be IDE-focused. I am not sure what to
do with this data?
--- snip ---
[root@dhcp-178-1-168-192 root]# hdparm -tT /dev/sda
/dev/sda:
Timing buffer-cache reads: 3164 MB in 2.00 seconds = 1583.03 MB/sec
Timing buffered disk reads: 166 MB in 3.00 seconds = 55.30 MB/sec
[root@dhcp-178-1-168-192 root]# hdparm -tT /dev/sda
/dev/sda:
Timing buffer-cache reads: 3432 MB in 2.00 seconds = 1718.84 MB/sec
Timing buffered disk reads: 168 MB in 3.03 seconds = 55.53 MB/sec
[root@dhcp-178-1-168-192 root]# cat /proc/interrupts
CPU0 CPU1
0: 1018635 980361 IO-APIC-edge timer
1: 525 625 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-level acpi
14: 1243 1009 IO-APIC-edge ide0
15: 16536 2635 IO-APIC-edge libata
169: 60338 58591 IO-APIC-level uhci_hcd, uhci_hcd,
radeon@PCI:1:0:0177: 0 0 IO-APIC-level uhci_hcd
185: 0 0 IO-APIC-level Intel ICH5
193: 27080 0 IO-APIC-level uhci_hcd, eth0
201: 2 0 IO-APIC-level ehci_hcd
209: 0 0 IO-APIC-level rme9652
NMI: 0 0
LOC: 1998918 1999095
ERR: 0
MIS: 0
[root@dhcp-178-1-168-192 root]# cat /proc/irq
cat: /proc/irq: Is a directory
[root@dhcp-178-1-168-192 root]# ls /proc/irq
0 10 12 14 169 185 2 209 4 6 8 prof_cpu_mask
1 11 13 15 177 193 201 3 5 7 9
[root@dhcp-178-1-168-192 root]#
--- snip ---
cheers,
Noah
> - Mark
>
> On Fri, 12 Nov 2004 07:44:04 -0800, Noah Garrett Wallach
> <logic@enabled.com> wrote:
> >
> >
> > there isnt a lot of detail for the drive in my box. can somebody provide some
> > clues about tuning this drive?
> >
> > --- snip ---
> >
> > [root@dhcp-178-1-168-192 apt]# /sbin/hdparm /dev/sda
> >
> > /dev/sda:
> > readonly = 0 (off)
> > geometry = 19457/255/63, sectors = 312581808, start = 0
> >
> > --- snip ---
> >
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> >
>
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