From mboxrd@z Thu Jan 1 00:00:00 1970 From: Igor Podlesny Subject: Re: HugePages for MD's caches -- can this be done in modern kernel? Date: Sat, 7 Feb 2009 02:27:43 +0700 Message-ID: <43d009740902061127p1a8073ax231877c8ed3eeda9@mail.gmail.com> References: <43d009740902061008p968268bj30a03c6f97139bbe@mail.gmail.com> Reply-To: for.poige+linux@gmail.com Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids 2009/2/7 NeilBrown : > 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?