Re: Disk activity blocking serial interrupts (Linux 1.1.81 -> 1.1.90)

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#157

From: Brandon S. Allbery
Date: Thu, 09 Feb 1995 23:06

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Also sprach steve@g6vju.demon.co.uk (Steve Wyles) (<D3qtDy.Hu@g6vju.demon.co.uk>):
+---------------
| 	The symptoms show up as a reduction in serial io speed when there
| is any disk activity either to the internal IDE or external SCSI drive,
| this manifests as a significant retrying of TCP/IP packets over my dial-up
| slip link to my provider and also to a local machine using PPP under KA9Q.
+------------->8

It's rather worse than that:  since somewhere around 1.1.70 disk activity
preempts *everything* (the system just plain *stops* until the disk I/O
completes).  Given that this coincided with the appearance of spurious errors
from by BT445C, I suspect it also interacts rather badly with VLB disk
controllers.

++Brandon
--
Brandon S. Allbery KF8NH	 [44.70.248.67]		bsa@kf8nh.wariat.org
Linux development:  iBCS2, JNOS, MH	    MLS '96 (I do hope!)	 ~\U

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From: bsa@kf8nh.wariat.org (Brandon S. Allbery)
Subject: Re: Disk activity blocking serial interrupts (Linux 1.1.81 -> 1.1.90)
Message-ID: <1995Feb9.230612.493@kf8nh.wariat.org>
Organization: Brandon's Linux box and AmPR node, Mentor, OH
Date: Thu, 9 Feb 1995 23:06:12 GMT
References: <D3qtDy.Hu@g6vju.demon.co.uk>
Lines: 18

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