From: Nick Piggin <piggin@cyberone.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-mm@kvack.org, Nikita@Namesys.COM
Subject: Re: More vm benchmarking
Date: Wed, 25 Feb 2004 20:57:21 +1100 [thread overview]
Message-ID: <403C7181.6050103@cyberone.com.au> (raw)
In-Reply-To: <20040225014757.4c79f2af.akpm@osdl.org>
Andrew Morton wrote:
>Nick Piggin <piggin@cyberone.com.au> 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 ;)
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next prev parent reply other threads:[~2004-02-25 9:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-25 9:11 Nick Piggin
2004-02-25 9:21 ` Nick Piggin
2004-02-25 9:47 ` Andrew Morton
2004-02-25 9:57 ` Nick Piggin [this message]
2004-02-25 10:04 ` Andrew Morton
2004-02-25 11:50 ` Andrew Morton
2004-02-26 0:51 ` Nick Piggin
2004-02-26 1:14 ` Andrew Morton
2004-02-26 1:35 ` Nick Piggin
2004-02-26 1:57 ` Andrew Morton
2004-02-26 2:04 ` Nick Piggin
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