From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from atlas.CARNet.hr (zcalusic@atlas.CARNet.hr [161.53.123.163]) by kvack.org (8.8.7/8.8.7) with ESMTP id BAA09665 for ; Sat, 9 Jan 1999 01:33:17 -0500 Subject: Re: 2.2.0-pre[56] swap performance poor with > 1 thrashing task References: Reply-To: Zlatko.Calusic@CARNet.hr MIME-Version: 1.0 From: Zlatko Calusic Date: 09 Jan 1999 07:32:49 +0100 In-Reply-To: Dax Kelson's message of "Fri, 8 Jan 1999 23:28:16 -0700 (MST)" Message-ID: <87sodl552m.fsf@atlas.CARNet.hr> Sender: owner-linux-mm@kvack.org To: Dax Kelson Cc: Linus Torvalds , Steve Bergman , Andrea Arcangeli , brent verner , "Garst R. Reese" , Kalle Andersson , Ben McCann , bredelin@ucsd.edu, linux-kernel@vger.rutgers.edu, linux-mm@kvack.org, Alan Cox , "Stephen C. Tweedie" List-ID: Dax Kelson writes: > On 7 Jan 1999, Zlatko Calusic wrote: > > > > 1) Swap performance in pre-5 is much worse compared to pre-4 in > > *certain* circumstances. I'm using quite stupid and unintelligent > > program to check for raw swap speed (attached below). With 64 MB of > > RAM I usually run it as 'hogmem 100 3' and watch for result which is > > recently around 6 MB/sec. But when I lately decided to start two > > instances of it like "hogmem 50 3 & hogmem 50 3 &" in pre-4 I got 2 x > > 2.5 MB/sec and in pre-5 it is only 2 x 1 MB/sec and disk is making > > very weird and frightening sounds. My conclusion is that now (pre-5) > > system behaves much poorer when we have more than one thrashing > > task. *Please*, check this, it is a quite serious problem. > > I just tried this on 2.2.0-pre6 PentiumII 412Mhz, 128MB SDRAM, one IDE > disk (/ & swap). > > ./hogmem 200 3 > Memory speed: 9.01 MB/sec > > ./hogmem 100 3 & ./hogmem 100 3 > Memory speed: 0.96 MB/sec > Memory speed: 0.96 MB/sec > I have a fix for this, together with a great improvement in swapping speed that I'll be sending in few moments, after some final testing. pre6 is VERY good, and with my changes, we will have fastest MM ever! -- Zlatko -- This is a majordomo managed list. To unsubscribe, send a message with the body 'unsubscribe linux-mm me@address' to: majordomo@kvack.org