From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 31 Aug 2001 11:32:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 31 Aug 2001 11:31:52 -0400 Received: from h24-64-71-161.cg.shawcable.net ([24.64.71.161]:36603 "EHLO webber.adilger.int") by vger.kernel.org with ESMTP id ; Fri, 31 Aug 2001 11:31:38 -0400 From: Andreas Dilger Date: Fri, 31 Aug 2001 09:31:09 -0600 To: "Kevin P. Fleming" Cc: Doug Ledford , linux-kernel@vger.kernel.org Subject: Re: 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable Message-ID: <20010831093109.R541@turbolinux.com> Mail-Followup-To: "Kevin P. Fleming" , Doug Ledford , linux-kernel@vger.kernel.org In-Reply-To: <05c501c13178$43e19ba0$6caaa8c0@kevin> <3B8E7F0D.3000503@redhat.com> <000d01c131d4$a8449820$6caaa8c0@kevin> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000d01c131d4$a8449820$6caaa8c0@kevin> User-Agent: Mutt/1.3.20i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Aug 30, 2001 21:23 -0700, Kevin P. Fleming wrote: > OK, I see that now... and it looks like the risks associated with setting > the unmaskirq flags on my drives (none of the four drives have it set now) > are too great to be worth playing with it. I'll just not use my PPP > connection during these particularly heavy disk activity moments. Thanks for > the quick response. There was a kernel patch (or possibly a user-space tool) which allowed one to change the "priority" of IRQs and their handlers. This was back in the 1.2 or 2.0 days, when _any_ disk or other interrupt activity might be enough to cause problems for serial connections (especially if you only had a 16450 UART (1 byte buffer) instead of a 16550 (16 byte buffer). You could make your serial interrupt (handler) take priority over disk interrupts. Maybe Ted Ts'o or other long-time Linux folks will know what was actually called, and whether it is still applicable to modern hardware/kernel. Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert