Messages in this thread | | | Date | Fri, 18 Jan 2002 08:58:50 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] 2.5.3-pre1 ata-253p1-2 |
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On Fri, Jan 18 2002, Anton Altaparmakov wrote: > >> You have to give Jens the credit for gluing it togather, because there > >was > >> no way I would have figured out the suttle issues of BIO. There are > >> serveral additions need to fix all the archs so hope to have something > >> today. > > > >Well, good work to both of you. It is an excellent driver. Please > >submit it for pre2. > > I second that. 2.5.3-pre1 + 2nd patch from Jens + daft compile fixes is > running fine on my Athlon/VIA chipset both UDMA100 and PIO4 on my 60GXP > drive! Brilliant work guys!
Thanks!
> There is only one odd thing and that is that PIO transfers are slower in > 2.5.3-pre1 + 2nd patch from Jens + daft compile fixes compared to in > 2.5.2-pre11-vanilla. > > PIO mode, hdparm -t /dev/hda: > > on 2.5.3-pre1 + 2nd Jens patch: 4.62MB/s > on 2.5.2-pre11 vanilla: 7.36MB/s > > DMA transfers are the same with both kernels, peaking at 38-39MB/s which is > I believe the theoretical upper limit for the 60GXP so there was not much > room for visible improvement (2.5.3-pre1 is slightly faster in that it gave > in three tests 38.79MB/s while 2.5.2-pre11 gave in three tests 38.32MB/s, > so if you believe those ACB is .4 MB/s faster). > > I don't care that PIO has become slower, all modern devices are happy with > UDMA, and so am I. (-: But I thought I should mention it.
Interesting, I dunno where this performance decrease comes from right now. But I'm sure we can make it go at least as fast as 2.5.2-pre11, the primary concern right now was solid PIO + mult mode again, and I think we've achieved that.
> Note that 2.5.3-pre1 now survives find . -type f -exec md5sum "{}" \; both > in PIO and UDMA mode so it can really be considered stable on UP system.
Great, thanks for testing.
-- Jens Axboe
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