Bug 5791 - pcnet_cs off-by-one buffers after link-down/link-up?
pcnet_cs off-by-one buffers after link-down/link-up?
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Michael K. Johnson
Depends On:
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Reported: 1999-10-09 17:54 EDT by paul
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2000-02-17 19:42:50 EST
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Description paul 1999-10-09 17:54:29 EDT
RH 6.1
Dell Inspiron 3500
D-Link DMF-560TX combo ethernet/modem pcmcia card

Begin with system functioning normally. Ping a host on the
same ethernet segment, see normal ping times (less than

Disconnect twisted pair ethernet cable for a few seconds,
then reconnect. Ping times are now 1000 msec + a fraction
of a msec, i.e., exactly 1 second late. Other network
performance (e.g., nfs, etc.) becomes terrible.

execute "ifconfig down up". Ping times return to normal
and other network performance returns to normal.

This behaves like an off-by-one buffer pointer problem
triggered by link-down/link-up. Maybe a packet doesn't
get transmitted until another packet gets queued behind it.
Comment 1 Cristian Gafton 2000-01-04 17:26:59 EST
Assigned to dledford
Comment 2 David Hinds 2000-02-17 19:42:59 EST
I think this is fixed in the current PCMCIA driver package.  It was fixed in

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