GJournal (hopefully) final patches.

Eric Anderson anderson at centtech.com
Thu Aug 17 02:54:45 UTC 2006

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 Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.

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