On Sat, Aug 28, 2004 at 04:01:35PM +0800, John Summerfield wrote:
> John Summerfield wrote:
>
> >Sven Luther wrote:
> >
> >>>fwiw I noticed something very like this between 2.2 and 2.4 when 2.4
> >>>was new: 2.2 was faster on my Pentium system. I think it was a
> >>>earlier version of the same chipset.
> >>>
> >>>Here are results on 2.6.7-1-k7:
> >>>/dev/hda:
> >>>Timing buffered disk reads: 108 MB in 3.02 seconds = 35.78 MB/sec
> >>>
> >>>/dev/hdg:
> >>>Timing buffered disk reads: 120 MB in 3.01 seconds = 39.93 MB/sec
> >>>kowari:/etc#
> >>>
> >>>Both drives are WD120 Gb (different models), hdg is on an Abit
> >>>hotrod66 (promise chips).
> >>>
> >>
> >>
> >>And how much you would get in 2.4 ?
> >>
> >>
> >Sorry.
> >
> >kowari:~# hdparm -t /dev/hd{a,g}{,}
> >
> >/dev/hda:
> >Timing buffered disk reads: 152 MB in 3.02 seconds = 50.33 MB/sec
> >/dev/hda:
> >Timing buffered disk reads: 152 MB in 3.02 seconds = 50.33 MB/sec
> >
> >/dev/hdg:
> >Timing buffered disk reads: 120 MB in 3.02 seconds = 39.74 MB/sec
> >
> >/dev/hdg: Timing buffered disk reads: 120 MB in 3.00 seconds =
> >40.00 MB/sec
> >kowari:~# uname -r
> >2.4.26-1-k7
> >kowari:~#
>
>
> I have further results, and I've just filed a bug report (confirmation
> not in yet so no no).
> kowari:~# hdparm -t /dev/hd{a,g}{,}
>
> /dev/hda:
> Timing buffered disk reads: 112 MB in 3.05 seconds = 36.73 MB/sec
>
> /dev/hda:
> Timing buffered disk reads: 110 MB in 3.00 seconds = 36.64 MB/sec
>
> /dev/hdg:
> Timing buffered disk reads: 118 MB in 3.01 seconds = 39.21 MB/sec
>
> /dev/hdg:
> Timing buffered disk reads: 120 MB in 3.01 seconds = 39.83 MB/sec
> kowari:~# uname -r
> 2.6.8-1-k7
> kowari:~#
>
>
> It's a self-built kernel, but without modification.
>
> I neglected to include a modules listing in the bug report. Here are
> those myst likely to be involved:
> ide_generic 1472 0
> sis5513 16776 1
> hpt366 22788 2
> ide_disk 19264 5 hpt366
> ide_core 138776 5
> usb_storage,ide_generic,sis5513,hpt366,ide_disk
> sd_mod 21632 0
> ata_piix 8132 0
> libata 41348 1 ata_piix
> scsi_mod 124620 3 usb_storage,sd_mod,libata
> unix 28592 170
I wonder if your ide chipset got correctly detected (aparently), and if dma
and other such parameters are identic.
Also, i suppose that this may be the result of the libataization of said
driver, could that be possible ?
Friendly,
Sven Luther
