Date: Wed, 16 Aug 2006 21:55:06 -0500 From: Eric Anderson <anderson@centtech.com> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-geom@freebsd.org Subject: Re: GJournal (hopefully) final patches. Message-ID: <44E3DA8A.8060808@centtech.com> In-Reply-To: <20060810223901.GC1389@garage.freebsd.pl> References: <20060808195202.GA1564@garage.freebsd.pl> <20060810192152.GE57857@europa.expro.pl> <20060810194304.GB1345@garage.freebsd.pl> <20060810200135.GF57857@europa.expro.pl> <20060810223901.GC1389@garage.freebsd.pl>
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On 08/10/06 17:39, Pawel Jakub Dawidek wrote: > 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. > By the way, this is true for at least the QLogic Fiber channel cards (isp). Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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