From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "Alan Cox" <alan@lxorguk.ukuu.org.uk>, "Zapp Foster" <zzaappp@yahoo.com>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: Performance improvement inquiry
Date: Sun, 13 Oct 2002 01:58:49 +0200 [thread overview]
Message-ID: <20021012235849.21437@192.168.4.1> (raw)
In-Reply-To: <1034458414.15067.25.camel@irongate.swansea.linux.org.uk>
>> First question: Will compiling a kernel with
>> the network module resident (as opposed to a loadable
>> module) make network performance any better? From
>> the reading, it appears that resident modules are only
>> faster in initialization, not runtime. I'm new to
>> this, so please correct me if I'm wrong.
>
>Modules are very very fractionally slower than compiled in code due to
>TLB misses
Depends on which arch... on ppc32 (ahem... no bad joke pls ;),
function calls from modules to kernel or between modules has to
go through some "branch islands" as they don't fit within the
scope of a "short" branch PPC insn. So you also get a small
perf. loss there, but I bet it's barely measurable.
Ben.
next prev parent reply other threads:[~2002-10-12 23:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-12 20:26 Zapp Foster
2002-10-12 21:33 ` Alan Cox
2002-10-12 23:58 ` Benjamin Herrenschmidt [this message]
2002-10-13 0:51 Joseph D. Wagner
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