From: Bryan Rittmeyer <bryanr@bryanr.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.linuxppc.org
Subject: Re: [patch] oprofile + ppc750cx perfmon
Date: Tue, 25 Mar 2003 21:04:49 -0800 [thread overview]
Message-ID: <20030326050449.GB32590@bryanr.org> (raw)
In-Reply-To: <1048585501.581.16.camel@zion.wanadoo.fr>
On Tue, Mar 25, 2003 at 10:45:02AM +0100, Benjamin Herrenschmidt wrote:
> I also think we could actually be smarter and only
> soft-disable IRQs with a flag in the descriptor, and hard disable
> them if and only if they actually occur while disabled.
yup. minimizing open_pic I/O could be a big win. the fact that
the PIC shows up _way_ ahead of the network driver and stack is
pretty freakish compared to a profile on x86 using io-apic
(the legacy x86 pic has similar but less severe issues as open_pic).
-Bryan
next prev parent reply other threads:[~2003-03-26 5:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-25 5:09 [patch] oprofile + ppc750cx perfmon Bryan Rittmeyer
2003-03-25 8:57 ` Bryan Rittmeyer
2003-03-25 9:45 ` Benjamin Herrenschmidt
2003-03-26 5:04 ` Bryan Rittmeyer [this message]
[not found] ` <20030325174309.GB57374@compsoc.man.ac.uk>
2003-03-26 3:50 ` Bryan Rittmeyer
[not found] ` <20030327010121.GA94874@compsoc.man.ac.uk>
2003-03-28 8:50 ` Bryan Rittmeyer
[not found] <20030327130535.GA1132@bryanr.org>
[not found] ` <F0BBB858-6093-11D7-BD8D-000393C30512@motorola.com>
2003-03-28 8:31 ` Bryan Rittmeyer
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