linux-kernel - Re: Is interrupt priority supported ?

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Message-ID: <20090219204902.GA3990@rhlx01.hs-esslingen.de>
Date:	Thu, 19 Feb 2009 21:49:02 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Jose Luis Marchetti <joseluismarchetti@...oo.com.br>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Is interrupt priority supported ?

Hi,

it has been for a looong time (those things tend to almost get outdated already -
witness the floppy controller misery):

# apt-cache show hwtools
Package: hwtools
Status: install ok installed
Priority: optional
Section: utils
Installed-Size: 312
Maintainer: Pierre Ancelot <eternityos@...e.fr>
Architecture: i386
Version: 0.8-5.1
Depends: debconf, libc6 (>= 2.3.5-1)
Suggests: sysutils, hdparm, scsitools, memtest86
Conffiles:
 /etc/init.d/hwtools 137e3fbdc26d90bec745a36d1ffd8661
Description: collection of tools for low-level hardware management
 This package is a collection of tools useful for hardware
 troubleshooting and optimization (for ix86 machines):
 .
  irqtune: adjusts priority of interrupts (improves serial performance),
  scanport: scans for hardware not already handled by Linux drivers,
  memmxtest: a real mode memory test, with MMX support.  You may want
  to look at package memtest86 as well.
  qic-02 driver and configuration utilities. Adds the qic-02 tapes support
 .
 Be aware that these tools require some knowledge of what are they
 doing to be used properly, otherwise they may cause damage to your system.
 .
 Some programs that were previously part of this package have been
 moved to their own packages (hdparm, scsitools, memtest86)

I don't have any recent experience with irqtune myself, though, and I cannot
authoritatively state that it actually works at the moment,
but I'd be relatively surprised if it didn't.

You might want to enable some unfortunately often still default-disabled
hardware transceiver offloading of Ethernet frames, too, via ethtool -k or so,
to possibly reduce latency.

Plus PCI latency timings, via setpci or so (but that probably won't
matter).

HTHHAND,

Andreas Mohr
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