LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
To: Soeren Sonnenburg <kernel@nn7.de>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: prioritize PCI traffic ?
Date: Mon, 15 Jan 2007 19:23:44 +0530	[thread overview]
Message-ID: <45AB8768.7000907@linux.vnet.ibm.com> (raw)
In-Reply-To: <1168859265.15294.8.camel@localhost>


Soeren Sonnenburg wrote:
> Dear all,
> 
> is it possible to explicitly tell the kernel to prioritize PCI traffic
> for a number of cards in pci slots x,y,z ?
> 
> I am asking as severe ide traffic causes lost frames when watching TV
> using 2 DVB cards + vdr... This is simply due to the fact that the PCI
> bus is saturated...

How do you know that the bus is saturated?
Are you streaming data to/from the ide hard disks/CDROM?
Do you have DMAs 'ON' for the hard disks?
Is everything just fine if there are no IDE traffic?
Are you running 2.6 kernel with preempt 'ON'?
Are all hardware on the same IRQ line? (shared interrupts)

> So, is any prioritizing of the PCI bus possible ?

The drivers + application indirectly can control priority on the
bus.  Just reduce the priority of the application that uses IDE and
see if adjusting nice values of applications can change the scenario.

--Vaidy

> Best
> Soeren
> --
> Sometimes, there's a moment as you're waking, when you become aware of
> the real world around you, but you're still dreaming.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 


  parent reply	other threads:[~2007-01-15 13:54 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-15 11:07 Soeren Sonnenburg
2007-01-15 12:01 ` Andreas Mohr
2007-01-15 12:07   ` Soeren Sonnenburg
2007-01-15 13:53 ` Vaidyanathan Srinivasan [this message]
2007-01-15 14:00   ` Soeren Sonnenburg
2007-01-15 14:53     ` Vaidyanathan Srinivasan
2007-01-17 20:22       ` Hans-Peter Jansen
2007-01-27  0:32         ` Lee Revell
     [not found] <fa.IZ3qyPHQu5qQWnA4jBWoHC54zJE@ifi.uio.no>
2007-01-15 14:24 ` Robert Hancock

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=45AB8768.7000907@linux.vnet.ibm.com \
    --to=svaidy@linux.vnet.ibm.com \
    --cc=kernel@nn7.de \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: prioritize PCI traffic ?' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).