From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 8 Jan 2001 21:03:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 8 Jan 2001 21:03:22 -0500 Received: from inje.iskon.hr ([213.191.128.16]:23817 "EHLO inje.iskon.hr") by vger.kernel.org with ESMTP id ; Mon, 8 Jan 2001 21:03:04 -0500 To: Rik van Riel Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: Subtle MM bug In-Reply-To: Reply-To: zlatko@iskon.hr X-Face: s71Vs\G4I3mB$X2=P4h[aszUL\%"`1!YRYl[JGlC57kU-`kxADX}T/Bq)Q9.$fGh7lFNb.s i&L3xVb:q_Pr}>Eo(@kU,c:3:64cR]m@27>1tGl1):#(bs*Ip0c}N{:JGcgOXd9H'Nwm:}jLr\FZtZ pri/C@\,4lW<|jrq^<):Nk%Hp@G&F"r+n1@BoH From: Zlatko Calusic Date: 09 Jan 2001 03:01:52 +0100 In-Reply-To: Rik van Riel's message of "Sun, 7 Jan 2001 19:37:06 -0200 (BRDT)" Message-ID: <87y9wlh4a7.fsf@atlas.iskon.hr> User-Agent: Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.2 (Peisino,Ak(B) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Rik van Riel writes: > Now if 2.4 has worse _performance_ than 2.2 due to one > reason or another, that I'd like to hear about ;) > Oh, well, it seems that I was wrong. :) First test: hogmem 180 5 = allocate 180MB and dirty it 5 times (on a 192MB machine) kernel | swap usage | speed ------------------------------- 2.2.17 | 48 MB | 11.8 MB/s ------------------------------- 2.4.0 | 206 MB | 11.1 MB/s ------------------------------- So 2.2 is only marginally faster. Also it can be seen that 2.4 uses 4 times more swap space. If Linus says it's ok... :) Second test: kernel compile make -j32 (empirically this puts the VM under load, but not excessively!) 2.2.17 -> make -j32 392.49s user 47.87s system 168% cpu 4:21.13 total 2.4.0 -> make -j32 389.59s user 31.29s system 182% cpu 3:50.24 total Now, is this great news or what, 2.4.0 is definitely faster. -- Zlatko - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/