From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <403C7181.6050103@cyberone.com.au> Date: Wed, 25 Feb 2004 20:57:21 +1100 From: Nick Piggin MIME-Version: 1.0 Subject: Re: More vm benchmarking References: <403C66D2.6010302@cyberone.com.au> <20040225014757.4c79f2af.akpm@osdl.org> In-Reply-To: <20040225014757.4c79f2af.akpm@osdl.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: linux-mm@kvack.org, Nikita@Namesys.COM List-ID: Andrew Morton wrote: >Nick Piggin wrote: > >>kernel | run | -j5 | -j10 | -j15 | >> 2.6.3 1 136 886 2511 >> 2.6.3 2 150 838 2465 >> >> -mm2 1 136 646 1484 >> -mm2 2 142 676 1265 >> >> -mm3 1 135 881 1828 >> -mm3 2 146 790 1844 >> >> This quite clearly shows your patches hurting as I told you. >> > >Probably. But these differences are small, relative to some differences >wrt 2.4.x > > 2.4 should be pretty close to -mm2 for -j10 and hopefully a bit worse at -j15. That is what previous benchmarks have been showing anyway. I better get some 2.4 numbers. Either way, they're not that small. >>Why did it get slower? >> > >Dunno. Maybe the workload prefers imbalanced zone scanning. > > Seriously? I find that a bit hard to swallow. Especially considering I wouldn't have anything that uses ZONE_DMA on this system. >>I assume it is because the batching patch places uneven >> pressure on normal and DMA zones. >> > >The patch improves highmem-vs-lowmem balancing from 10:1 to 1:1. What >makes you think that it worsens ZONE_NORMAL-vs-ZONE_DMA balancing? > >It's easy enough to instrument - just split pgsteal_lo into pgsteal_normal >and pgsteal_dma. > > Sure that can tell you if something is really wrong, but it is pretty hard to read much from that. Anyway I don't have code or numbers right now so that means I have to shut up ;) -- 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-mm.org/ . Don't email: aart@kvack.org