From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Significant Memory Reduction Using Huge Page Patch on Database Workload Message-ID: From: "Peter Wong" Date: Fri, 25 Oct 2002 11:38:58 -0500 MIME-Version: 1.0 Content-type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: akpm@zip.com.au, William Lee Irwin III , linux-mm@kvack.org, lse-tech@lists.sourceforge.net Cc: Bill Hartner , "Martin J. Bligh" List-ID: (1) 2.5.43-mm2: 2.5.43 + Andrew Morton's mm2 patch (2) 2.5.43-mm2+huge: 2.5.43 + Andrew Morton's mm2 patch + Bill Irwin's hugetlb patch Andrew' mm2 patch can be found at: http://www.zipworld.com.au/~akpm/linux/patches/2.5/2.5.43/2.5.43-mm2/. The objective of this comparison is to measure the impact of Bill's patch. We used 680 for nr_hugepages, ~2.66 GB for the runs. ---------------------------------------------------------------------- System Information: - 8-way 700MHz Pentium III Xeon processors, 2MB L2 Cache - 4GB RAM - 6 SCSI controllers connected to 120 9.1 GB disks with 10K RPM ---------------------------------------------------------------------- Based upon the performance metrics and CPU utilization, the two kernels achieve similar performance. However, memory consumption by rmap and page tables is reduced significantly by using Bill's patch. 2.5.43-mm2 2.5.43-mm2+huge ============================================================== pte_chain (max) (MB) 4.3 182.4 PageTables (max) (MB) 9.5 153.7 In total, we save ~322 MB in the low memory area. Regards, Partha and Peter Partha Narayanan and Peter Wai Yee Wong IBM LTC Performance Team email: wpeter@us.ibm.com -- 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/