* HugePages for MD's caches -- can this be done in modern kernel?
[not found] <43d009740902061008p968268bj30a03c6f97139bbe@mail.gmail.com>
@ 2009-02-06 18:11 ` Igor Podlesny
[not found] ` <c39d1fabb5aef8e2ed5158ad59802cf1.squirrel@neil.brown.name>
1 sibling, 0 replies; 3+ messages in thread
From: Igor Podlesny @ 2009-02-06 18:11 UTC (permalink / raw)
To: linux-raid; +Cc: neilb, H. Peter Anvin
Hi!
$(Subj) :-) Is it worth of efforts?
P. S. Also, I deem there lots of structures in kernel that could
benefit from using HugePages.
But this probably a q-n for another kernel list.
--
End of message. Next message?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: HugePages for MD's caches -- can this be done in modern kernel?
[not found] ` <c39d1fabb5aef8e2ed5158ad59802cf1.squirrel@neil.brown.name>
@ 2009-02-06 19:27 ` Igor Podlesny
2009-02-06 20:16 ` NeilBrown
0 siblings, 1 reply; 3+ messages in thread
From: Igor Podlesny @ 2009-02-06 19:27 UTC (permalink / raw)
To: NeilBrown; +Cc: linux-raid
2009/2/7 NeilBrown <neilb@suse.de>:
> On Sat, February 7, 2009 5:08 am, Igor Podlesny wrote:
>> Hi!
>>
>> $(Subj). :-)
>>
>> P. S. Also, I deem there lots of structures in kernel that could
>> benefit
>> from using HugePages. But this probably a q-n for another kernel list.
>
> I have only a vague idea what HugePages are and it is not at all clear to
> me why you would want to use them for the MD cache. I assume you are
>
HugePages requires less TBL entries so they better fit for large
buffers, as far as I understand.
http://unixfoo.blogspot.com/2007/10/hugepages.html
http://linux-mm.org/HugePagesArticles
> talking about MD/RAID456 as that is the only place we use a cache.
>
Yeah, "stripe_cache_size" setting.
>
> Maybe if you could explain what you are thinking....
>
Yeah, hope this would suffice.
--
End of message. Next message?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: HugePages for MD's caches -- can this be done in modern kernel?
2009-02-06 19:27 ` Igor Podlesny
@ 2009-02-06 20:16 ` NeilBrown
0 siblings, 0 replies; 3+ messages in thread
From: NeilBrown @ 2009-02-06 20:16 UTC (permalink / raw)
To: for.poige+linux; +Cc: linux-raid
On Sat, February 7, 2009 6:27 am, Igor Podlesny wrote:
> 2009/2/7 NeilBrown <neilb@suse.de>:
>> On Sat, February 7, 2009 5:08 am, Igor Podlesny wrote:
>>> Hi!
>>>
>>> $(Subj). :-)
>>>
>>> P. S. Also, I deem there lots of structures in kernel that could
>>> benefit
>>> from using HugePages. But this probably a q-n for another kernel list.
>>
>> I have only a vague idea what HugePages are and it is not at all clear
>> to
>> me why you would want to use them for the MD cache. I assume you are
>>
> HugePages requires less TBL entries so they better fit for large
> buffers, as far as I understand.
>
> http://unixfoo.blogspot.com/2007/10/hugepages.html
> http://linux-mm.org/HugePagesArticles
>
>> talking about MD/RAID456 as that is the only place we use a cache.
>>
> Yeah, "stripe_cache_size" setting.
>>
>> Maybe if you could explain what you are thinking....
>>
> Yeah, hope this would suffice.
Not really, no.
md does not use "large buffers", Just lots of little buffers.
NeilBrown
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-02-06 20:16 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <43d009740902061008p968268bj30a03c6f97139bbe@mail.gmail.com>
2009-02-06 18:11 ` HugePages for MD's caches -- can this be done in modern kernel? Igor Podlesny
[not found] ` <c39d1fabb5aef8e2ed5158ad59802cf1.squirrel@neil.brown.name>
2009-02-06 19:27 ` Igor Podlesny
2009-02-06 20:16 ` NeilBrown
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox