Spurious DMA Interrupts

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#4735

From: druck Dennis W. Ruck
Date: Wed, 06 Jan 1993 15:05

59 lines
2627 bytes

I have what I believe is a network related problem, but my network gurus here  
have been unable to track down any problems. The symptons are that whenever I  
perform some function that requires network access (nfs, ftp, ...) I get error  
messages of the following sort logged:

Spurious DMA interrupt - state = 1000000 @ 2000110
en0: transmitter not ready
spurious DMA interrupt
spurious DMA interrupt
spurious DMA interrupt
NFS server frodo not responding still trying
Jan  5 15:45:12 gandalf lookupd[77]: netinfo failure, sleeping
NFS server frodo ok
Jan  5 15:59:31 gandalf lookupd[77]: netinfo waking
NFS server frodo not responding still trying

spurious DMA interrupt
Spurious DMA interrupt - state = 1000000 @ 2000110
Spurious DMA interrupt - state = 1000000 @ 2000110
spurious DMA interrupt


Network access is definitely slower than before these symptons cropped up.  
Also, ping gives unusual results as shown:

gandalf<54> ping frodo
PING frodo: 56 data bytes
64 bytes from 129.92.100.18: icmp_seq=1. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=2. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=3. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=4. time=38. ms
64 bytes from 129.92.100.18: icmp_seq=5. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=6. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=7. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=8. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=9. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=10. time=2. ms

[... lines deleted ...]

64 bytes from 129.92.100.18: icmp_seq=67. time=42. ms
64 bytes from 129.92.100.18: icmp_seq=68. time=2. ms
64 bytes from 129.92.100.18: icmp_seq=69. time=2. ms
^C
----frodo PING Statistics----
70 packets transmitted, 65 packets received, 7% packet loss
round-trip (ms)  min/avg/max = 2/6/60
gandalf<55> 

I would appreciate any help in tracking down the cause of these problems.

Thanks!

Dennis

--
Dennis W. Ruck               Air Force Institute of Technology
druck@afit.af.mil            Wright-Patterson AFB, Ohio
                             (NeXTmail Welcome)

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Message-ID: <1993Jan6.150503.532@afit.af.mil>

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Newsgroups: comp.sys.next.misc,comp.sys.next.sysadmin
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!udecc.engr.udayton.edu!blackbird.afit.af.mil!news
From: druck@.afit.af.mil  (Dennis W. Ruck)
Subject: Spurious DMA Interrupts
Message-ID: <1993Jan6.150503.532@afit.af.mil>
Sender: news@afit.af.mil
Nntp-Posting-Host: gandalf.afit.af.mil
Reply-To: druck@afit.af.mil (Dennis W. Ruck)
Organization: Air Force Institute of Technology
Date: Wed, 6 Jan 1993 15:05:03 GMT
Lines: 59