Bug 20958

Description jhs 2000-08-31 08:40:01 UTC

With 4.1 I seem to be able to easily thrash FreeBSD into letting the ep driver  
interface lock up.  Symptom seems to be seeing OACTIVE with ifconfig ep0
I suppose it's maybe swapping to hell, but I've not seen  
this poor behavious on previous FreeBSD releases with same hardware
& similar loads ( It's a little 486 33M laptop with 12M, X11, ether, 1gig of 
IDE, & a few remote xterms moving trees, nfs heavy ide io etc. )

Fix: 

No idea, but as those kernel developers who likely do have ideas,
	likely also have newer hardware which maybe wont see this, I
	jhs@freebsd.org will volunteer to be guinea pig for experiments
	/ diffs to try, if someone suggests diffs or sysctls.
	I guess maybe some kernel assumptions/constants need to be 
	changed/increased ?  An ifconfig down, up resets it temporarily.
How-To-Repeat: 
	Get a slow disc, reduce ram, load & thrash.
	In case you can't do that, here's my log
---
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 2  % ping flip
  PING flip.jhs.private (192.168.91.24): 56 data bytes
  ping: sendto: No buffer space available
  ping: sendto: No buffer space available
  ping: sendto: No buffer space available
  ^C
  --- flip.jhs.private ping statistics ---
  3 packets transmitted, 0 packets received, 100% packet loss
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 4 % ifconfig -a
  ep0: flags=8c43<UP,BROADCAST,RUNNING,OACTIVE,SIMPLEX,MULTICAST> mtu 1500
          inet 192.168.91.33 netmask 0xffffff00 broadcast 192.168.91.255
          inet6 fe80::220:afff:fe0d:f426%ep0 prefixlen 64 scopeid 0xa
          ether 00:20:af:0d:f4:26
          media: 10base2/BNC
          supported media: 10base2/BNC 10baseT/UTP 10base5/AUI
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 6 % su
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 101 % ifconfig ep0 down
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 102 % ifconfig ep0 up
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 103 % ping flip
  PING flip.jhs.private (192.168.91.24): 56 data bytes
  64 bytes from 192.168.91.24: icmp_seq=0 ttl=255 time=0.981 ms
  64 bytes from 192.168.91.24: icmp_seq=1 ttl=255 time=0.947 ms
  ^C
  --- flip.jhs.private ping statistics ---
  4 packets transmitted, 4 packets received, 0% packet loss
  round-trip min/avg/max/stddev = 0.935/0.950/0.981/0.019 ms
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 104 % ifconfig -a
  ep0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
          inet 192.168.91.33 netmask 0xffffff00 broadcast 192.168.91.255
          inet6 fe80::220:afff:fe0d:f426%ep0 prefixlen 64 scopeid 0xa
          ether 00:20:af:0d:f4:26
          media: 10base2/BNC
          supported media: 10base2/BNC 10baseT/UTP 10base5/AUI
  jhs@lapt.jhs.private 4.1-RELEASE csh ttyp2 105 %
---