From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 11 Feb 2001 00:05:43 -0200 (BRST) From: Marcelo Tosatti Subject: Re: mmap002 execution time doubled... good or bad sign? In-Reply-To: <01021023231906.02374@dox> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Roger Larsson Cc: linux-mm@kvack.org List-ID: On Sat, 10 Feb 2001, Roger Larsson wrote: > Hi, > > I have been running various stress tests on disk for some time. > streaming write, copy, read, diff, dbench and mmap002 > > This is what I have seen: > > >From 2.4.0 to 2.4.1 with Marcelos patch write were above 10 MB/s > and read >13 MB/s, dbench > 10 MB/s, mmap took around 2m30. > > After 2.4.1-pre8 (did not test anything in between) > Write is at 9-10 [lost 1 MB/s] read is down to 11-12 MB/s [lost 2 MB/s] > dbench > 9 MB/s [one MB/s there too] > > But the really strange one - mmap002 now takes > 4m30 > Is this expected / good behaviour? mmap002 abuses mmaps... These are probably Jens modifications to the block queuing mechanisms since there were no VM changes from 2.4.1-pre8 to now in Linus tree. Its not necessarily a bad thing, since Jens modifications make processes throttle on IO sooner. -- 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/