From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 15 Jan 2001 21:49:16 +0100 (CET) From: Mike Galbraith Subject: Re: mmap()/VM problems in 2.4.0 In-Reply-To: <87hf30d0ar.fsf@atlas.iskon.hr> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Zlatko Calusic Cc: Vlad Bolkhovitine , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On 15 Jan 2001, Zlatko Calusic wrote: > "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. My box thinks quite highly of that patch fwiw, but insists that he needs to apply Jens Axboes' blk patch first ;-) (Not because of tiobench) -Mike -- 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/