From: Ralf Baechle <ralf@linux-mips.org>
To: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH 0/3] MIPS vdso and signal delivery optimization (v2)
Date: Fri, 19 Feb 2010 14:57:27 +0100 [thread overview]
Message-ID: <20100219135727.GA15581@linux-mips.org> (raw)
In-Reply-To: <1266538385-29088-1-git-send-email-ddaney@caviumnetworks.com>
On Thu, Feb 18, 2010 at 04:13:02PM -0800, David Daney wrote:
> Before:
> n64 - Signal handler overhead: 14.517 microseconds
> n32 - Signal handler overhead: 14.497 microseconds
> o32 - Signal handler overhead: 16.637 microseconds
>
> After:
>
> n64 - Signal handler overhead: 7.935 microseconds
> n32 - Signal handler overhead: 7.334 microseconds
> o32 - Signal handler overhead: 8.628 microsecond
On a 180MHz 2 CPU single-node IP27:
Before:
Signal handler installation: 3.524 microseconds
Signal handler overhead: 37.009 microseconds
Protection fault: 4.264 microseconds
After:
Signal handler installation: 3.536 microseconds
Signal handler overhead: 14.331 microseconds
Protection fault: 3.600 microseconds
Everything meassured with very ancient O32 lmbench 2-alpha11 binaries.
IP27 has processors in separate packages so the cache-to-cache overhead
and thus the speedup is much higher than you have observed.
In 2.4 we used to have drastically better signal latency numbers btw. I
wonder where all that performance went down the drain.
Ralf
next prev parent reply other threads:[~2010-02-19 13:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-19 0:13 [PATCH 0/3] MIPS vdso and signal delivery optimization (v2) David Daney
2010-02-19 0:13 ` [PATCH 1/3] MIPS: Add SYSCALL to uasm David Daney
2010-03-16 19:55 ` Ralf Baechle
2010-02-19 0:13 ` [PATCH 2/3] MIPS: Preliminary vdso David Daney
2010-02-23 20:40 ` Manuel Lauss
2010-02-23 21:27 ` David Daney
2010-02-23 21:35 ` Ralf Baechle
2010-03-16 19:55 ` Ralf Baechle
2010-02-19 0:13 ` [PATCH 3/3] MIPS: Move signal trampolines off of the stack David Daney
2010-03-16 19:56 ` Ralf Baechle
2010-02-19 2:02 ` [PATCH 0/3] MIPS vdso and signal delivery optimization (v2) David Daney
2010-02-19 22:08 ` David Daney
2010-02-19 13:57 ` Ralf Baechle [this message]
2010-02-19 14:38 ` Ralf Baechle
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