lkml.org 
[lkml]   [2004]   [Feb]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Worrisome IDE PIO transfers...
Date
On Sunday 29 of February 2004 20:23, Richard Zidlicky wrote:
> On Sun, Feb 29, 2004 at 09:52:08AM +0100, Geert Uytterhoeven wrote:
> > On Sun, 29 Feb 2004, Bartlomiej Zolnierkiewicz wrote:
> > > On Sunday 29 of February 2004 01:58, Jeff Garzik wrote:
> > > > > I like Alan's idea to use loopback instead of "bswap".
> > > >
> > > > Neat but no more zerocopy that way. I much prefer a
> > > > swap-as-you-go...
> > >
> > > Okay, better solution:
> > >
> > > - on Atari/Q40:
> > > if drive->bswap use insw/outsw instead of swapping variants
> >
> > Yep, that sounds the most logical. Richard?
>
> looks good.
>
> However it appears to fix only part of the problem - we need some
> logic to ensure only disk data is swapped.
> Bswapping WIN_DOWNLOAD_MICROCODE data would not be very
> clever I guess.

Actually drive->bswap should die as I overlooked the fact that we are
_not_ swapping disk data (byteswapped data is used for FS) on Atari/Q40.

Therefore the real solution is to use device-mapper instead of drive->bswap
and on Atari/Q40 use standard insw/outs only if blk_fs_request(drive->rq),
for everything else insw_swapw/outsw_swapw should be used.

Does it make any sense? :)

Bartlomiej

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:01    [W:0.521 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site