| To: | Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Info: NAPI performance at "low" loads |
| From: | ebiederm@xxxxxxxxxxxx (Eric W. Biederman) |
| Date: | 19 Sep 2002 08:58:49 -0600 |
| Cc: | "David S. Miller" <davem@xxxxxxxxxx>, hadi@xxxxxxxxxx, akpm@xxxxxxxxx, manfred@xxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx |
| In-reply-to: | <1032371453.20463.139.camel@irongate.swansea.linux.org.uk> |
| References: | <3D87A59C.410FFE3E@digeo.com> <Pine.GSO.4.30.0209172053360.3686-100000@shell.cyberus.ca> <20020917.180014.07882539.davem@redhat.com> <m1hegnky2h.fsf@frodo.biederman.org> <1032371453.20463.139.camel@irongate.swansea.linux.org.uk> |
| Sender: | netdev-bounce@xxxxxxxxxxx |
| User-agent: | Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 |
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> writes: > On Wed, 2002-09-18 at 18:27, Eric W. Biederman wrote: > > Plus I have played with calibrating the TSC with outb to port > > 0x80 and there was enough variation that it was unuseable. On some > > newer systems it would take twice as long as on some older ones. > > port 0x80 isnt going to PCI space. Agreed. It isn't going anywhere, and it takes it a while to recogonize that. > x86 generally posts mmio write but not io write. Thats quite measurable. The difference timing difference between posted and non-posted writes I can see. Eric |
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