Bug 51942 - long stalls when copying data to slow device
long stalls when copying data to slow device
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brock Organ
: 51944 85640 (view as bug list)
Depends On:
  Show dependency treegraph
Reported: 2001-08-17 06:25 EDT by Tim Waugh
Modified: 2008-08-01 12:22 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2004-09-30 11:39:07 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Tim Waugh 2001-08-17 06:25:00 EDT
Description of Problem:
When copying a large amount (approx 100Mb) of data to a parallel port ZIP 
drive (using the imm driver), interactive response is fine except that 
several tasks go into state D for minutes at a time.  These include kded, 
ps, konqueror, kicker, etc.: not all apps that are likely to be calling 
sync() or anything.

Version-Release number of selected component (if applicable):

How Reproducible:

Steps to Reproduce:
1. Copy a large file (> 80Mb or so) to a parallel port ZIP disk, or 
presumably any slow device
2. While that is copying, use the system interactively.

Actual Results:
Several processes (I noticed an uptime of 6) go into D state for lengthy 
periods of time.

Expected Results:
Interactive response is barely affected.

Additional Information:
Behaviour very similar to this was around before, and was fixed by the 
max_sectors patch having a thinko fixed.  I don't know if this is the 
same thing.  I couldn't find that bug in bugzilla to reopen.
Comment 1 Bernhard Rosenkraenzer 2001-08-20 07:14:59 EDT
*** Bug 51944 has been marked as a duplicate of this bug. ***
Comment 2 Tim Waugh 2001-09-28 08:39:33 EDT
The D-state processes seem to be in get_request_wait.  ps axl only shows me 
Comment 3 Tim Waugh 2002-02-04 03:43:08 EST
This still seems to be happening on 2.4.17-0.13!
Comment 4 Tim Waugh 2003-03-05 08:33:02 EST
*** Bug 85640 has been marked as a duplicate of this bug. ***
Comment 5 Bugzilla owner 2004-09-30 11:39:07 EDT
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem

The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, 
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/

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