GJournal (hopefully) final patches.

[Pawel Jakub Dawidek]

On Thu, Aug 10, 2006 at 10:01:35PM +0200, Jan Srzednicki wrote:
> On Thu, Aug 10, 2006 at 09:43:04PM +0200, Pawel Jakub Dawidek wrote:
> > On Thu, Aug 10, 2006 at 09:21:52PM +0200, Jan Srzednicki wrote:
> > > 
> > > Hello,
> > > 
> > > I'd happily perform some testing, only if the aac(4) driver would also
> > > be patched. I know I can run gjournal w/o the BIO_FLUSH feature, but
> > > that would make any performance results rather worthles, wouldn't it?
> > 
> > From my tests BIO_FLUSH doesn't have huge impact on performance (if at
> > all), but I suspect it greatly depends on specific HW.
> > 
> > Unfortunately I'm not able to implement BIO_FLUSH to all out storage
> > drivers. Currently BIO_FLUSH is supported by ata(4) (/dev/a[dr]X),
> > da(4) and amr(4).
> 
> I see. Does that mean that all CAM-interfaced devices (like asr(4) or
> twa(4)) have this feature fully implemented?

That's the theory. I'm using standard SCSI commands for this. From the
tests we made it seems that it works ok with twa(4)/twe(4).
I'd still be glad if someone with SCSI/CAM foo could look at the code.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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