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SubjectRe: IDE performance drop between 2.4.23 and 2.6.0 - pinpointed!
 --- Pawel Dziekonski <pawel.dziekonski@pwr.wroc.pl> a écrit : >
hi,
>
> same problem here however it seems that i have pinpointed it
> )at least
> for me):
>

from the manpage of hdparm:
-t Perform timings of device reads for benchmark and
compari-
son purposes. For meaningful results, this
operation
should be repeated 2-3 times on an otherwise
inactive sys-
tem (no other active processes) with at least a
couple of
megabytes of free memory.


if the above conditions are not met your test is irrelevant

> funny (? ;-) thing is that under 2.4 i have same issue...
>
> my chipset is kt133 (via), i use uhci.
>
> root@localhost:~ # cat /proc/interrupts
> CPU0
> 0: 2283127 XT-PIC timer
> 1: 4896 XT-PIC i8042
> 2: 0 XT-PIC cascade
> 8: 1 XT-PIC rtc
> 9: 0 XT-PIC acpi
> 10: 0 XT-PIC eth0, VIA686A
> 11: 271497 XT-PIC uhci_hcd, uhci_hcd
> 12: 171840 XT-PIC bttv0, nvidia
> 14: 33427 XT-PIC ide0
> 15: 1 XT-PIC ide1
> NMI: 0
> ERR: 4
>
> tested under pure 2.6.0. ac scheduler, same under noop and
> dead.
>
> regards, Pawel
>
> ps. i read the list via www so cc my the replies please.
> thanks.
> --
> Pawel Dziekonski <pawel.dziekonski|@|pwr.wroc.pl>, KDM WCSS
> avatar:0:0:
> Wroclaw Networking & Supercomputing Center, HPC Department
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