From: Dave Hansen <haveblue@us.ibm.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Russell King <rmk@arm.linux.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: Serial: updated serial drivers
Date: Mon, 15 Jul 2002 07:25:07 -0700 [thread overview]
Message-ID: <3D32DB43.3040906@us.ibm.com> (raw)
In-Reply-To: 20020715100310.GF23693@holomorphy.com
William Lee Irwin III wrote:
> On Sun, Jul 07, 2002 at 01:00:09AM +0100, Russell King wrote:
>
>>I've been maintaining a serial driver "off the side" of the ARM port
>>which cleans up the serial driver mess that we currently have, with
>>many duplications of serial.c, each with subtle bugs.
>
>
> global_cli() overhead on my testbox is a significant problem.
>
> Profile info from tbench 1024 with ttyS0 as stdout, taken on a 16 cpu
> i386 box with 16GB of RAM and irqbalance disabled, (needed to boot):
>
<snip profile>
>
> The disabling of irqbalance should make these profiling results valid.
So, is irqbalance the thing that is screwing up our profiles on 2.5?
We were getting some strage profiles that made us look at oprofile
again.
oprofile is really cool, but readprofile is dead simple.
--
Dave Hansen
haveblue@us.ibm.com
next prev parent reply other threads:[~2002-07-15 14:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-07 0:00 Serial: updated serial drivers Russell King
2002-07-07 10:01 ` Miquel van Smoorenburg
2002-07-15 10:03 ` William Lee Irwin III
2002-07-15 11:01 ` William Lee Irwin III
2002-07-15 11:24 ` Russell King
2002-07-15 18:17 ` William Lee Irwin III
2002-07-15 14:25 ` Dave Hansen [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-07-07 14:15 Marko Kohtala
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