* 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
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* 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
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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
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