From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: mmap()/VM problems in 2.4.0 References: <3A5EFB40.6080B6F3@sw.com.sg> <3A62C5F0.80C0E8B5@sw.com.sg> Reply-To: zlatko@iskon.hr From: Zlatko Calusic Date: 15 Jan 2001 21:31:56 +0100 In-Reply-To: "Vlad Bolkhovitine"'s message of "Mon, 15 Jan 2001 17:42:08 +0800" Message-ID: <87hf30d0ar.fsf@atlas.iskon.hr> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: Vlad Bolkhovitine Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: "Vlad Bolkhovitine" writes: > Here is updated info for 2.4.1pre3: > > Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/sec > > with mmap() > > File Block Num Seq Read Rand Read Seq Write Rand Write > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > ------- ------ ------- --- ----------- ----------- ----------- ----------- > . 1024 4096 2 1.089 1.24% 0.235 0.45% 1.118 4.11% 0.616 1.41% > > without mmap() > > File Block Num Seq Read Rand Read Seq Write Rand Write > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > ------- ------ ------- --- ----------- ----------- ----------- ----------- > . 1024 4096 2 28.41 41.0% 0.547 1.15% 13.16 16.1% 0.652 1.46% > > > Mmap() performance dropped dramatically down to almost unusable level. Plus, > system was unusable during test: "vmstat 1" updated results every 1-2 _MINUTES_! > You need Marcelo's patch. Please apply and retest. --- linux.orig/mm/vmscan.c Mon Jan 15 02:33:15 2001 +++ linux/mm/vmscan.c Mon Jan 15 02:46:25 2001 @@ -153,7 +153,7 @@ if (VALID_PAGE(page) && !PageReserved(page)) { try_to_swap_out(mm, vma, address, pte, page); - if (--count) + if (!--count) break; } } -- Zlatko -- 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.eu.org/Linux-MM/