From mboxrd@z Thu Jan 1 00:00:00 1970 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Subject: RE: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 Date: Fri, 4 Nov 2005 17:52:29 -0800 Message-ID: <01EF044AAEE12F4BAAD955CB75064943051354DA@scsmsx401.amr.corp.intel.com> From: "Seth, Rohit" Sender: owner-linux-mm@kvack.org From: Linus Torvalds Sent: Friday, November 04, 2005 8:01 AM Return-Path: To: Linus Torvalds , Andy Nelson Cc: akpm@osdl.org, arjan@infradead.org, arjanv@infradead.org, haveblue@us.ibm.com, kravetz@us.ibm.com, lhms-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mbligh@mbligh.org, mel@csn.ul.ie, mingo@elte.hu, nickpiggin@yahoo.com.au List-ID: >If I remember correctly, ia64 used to suck horribly because Linux had to >use a mode where the hw page table walker didn't work well (maybe it was >just an itanium 1 bug), but should be better now. But x86 probably kicks >its butt. I don't remember a difference of more than (roughly) 30 percentage points even on first generation Itaniums (using hugetlb vs normal pages). And few more percentage points when walker was disabled. Over time the page table walker on IA-64 has gotten more aggressive. ...though I believe that 30% is a lot of performance. -rohit -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org