In message <[EMAIL PROTECTED]>, Alfred Perlstein writes:
>* Poul-Henning Kamp <[EMAIL PROTECTED]> [000320 11:45] wrote:
>> In message <[EMAIL PROTECTED]>, Alfred Perlstein writes:
>>
>> >Keeping the currect cluster code is a bad idea, if the drivers were
>> >taught how to traverse the linked list in the buf struct rather
>> >than just notice "a big buffer" we could avoid a lot of page
>> >twiddling and also allow for massive IO clustering ( > 64k )
>>
>> Before we redesign the clustering, I would like to know if we
>> actually have any recent benchmarks which prove that clustering
>> is overall beneficial ?
>
>Yes it is really benificial.
>
>I'm not talking about a redesign of the clustering code as much as
>making the drivers that take a callback from it actually traverse
>the 'union cluster_info' rather than relying on the system to fake
>the pages being contiguous via remapping.
>
>There's nothing wrong with the clustering algorithms, it's just the
>steps it has to take to work with the drivers.
Hmm, try to keep vinum/RAID5 in the picture when you look at this code,
it complicated matters a lot.
--
Poul-Henning Kamp FreeBSD coreteam member
[EMAIL PROTECTED] "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!
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