GJournal (hopefully) final patches.

[Eric Anderson]

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


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