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From: Grant Grundler <grundler@parisc-linux.org>
To: Randolph Chung <randolph@tausq.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Improving performance of munmap
Date: Fri, 8 Oct 2004 11:35:01 -0600	[thread overview]
Message-ID: <20041008173501.GA16958@colo.lackof.org> (raw)
In-Reply-To: <20041008165926.GI14151@tausq.org>

On Fri, Oct 08, 2004 at 09:59:26AM -0700, Randolph Chung wrote:
> +#define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
> +int parisc_cache_flush_threshold = FLUSH_THRESHOLD;

6 monthes or so ago Alex Williamson ran some perf tests comparing a
CONSTANT vs global when tuning the IOMMU page size on IA64 ZX1 chipsets.
IIRC, using a global was 3-5% slower if it was the same value as the constant.
I don't know if parisc will offer a similar performance difference and if so,
a per arch (PA11 vs PA20) should work fine for everything but PA8800.
It may not be a problem, just something to consider.

The rest looks "correct" to me - ie I don't see any obviously wrong.

thanks,
grant
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      parent reply	other threads:[~2004-10-08 17:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-10-07 23:02 [parisc-linux] Improving performance of munmap Randolph Chung
2004-10-08  2:03 ` Carlos O'Donell
2004-10-08  4:16   ` Randolph Chung
2004-10-08 16:59     ` Randolph Chung
2004-10-08 17:05       ` Randolph Chung
2004-10-08 17:35       ` Grant Grundler [this message]

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