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Date: Thu, 10 Aug 2006 22:01:35 +0200
From: Jan Srzednicki <w@expro.pl>
To: Pawel Jakub Dawidek <pjd@FreeBSD.org>
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Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org,
	freebsd-geom@FreeBSD.org
Subject: Re: GJournal (hopefully) final patches.
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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?

-- 
Jan Srzednicki
w@expro.pl