GNIC II on Linux 2.2.x

[Logan Browne]

Actually, I am working on some performance testing with this card, and
just ran into a problem similar to this. When I send large number of UDP
pings at the card, the receiver will complain about "Too Much Work at
0x{something}", and after a bit the sender will start reporting errors
and kernel panic.

I would guess that we are experiencing similar problems. However I have
not yet been able to resolve these issues. We are also using 0.14 of the
module.

I hope that someone has a idea on how to fix this problem.

Good Luck

Logan Browne

Jason Holmes wrote:
> 
> Greetings.
> 
> Is anyone successfully using the GNIC II (hamachi) cards on Linux 2.2.x
> SMP?  We're seeing some strange problems.  For example, if the cards are
> brought up with the default MTU of 1500, packets larger than the MTU
> don't seem to fragment correctly.  I.e.,:
> 
> lion032g:~# ifconfig eth1
> eth1      Link encap:Ethernet  HWaddr 00:E0:B1:04:20:35
>           inet addr:10.0.1.33  Bcast:10.0.1.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:3844481 errors:119 dropped:0 overruns:0 frame:119
>           TX packets:3835079 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           Interrupt:19
> 
> lion032g:~# ping -c 2 -s 3000 lion031g
> PING lion031g.hpc.cac.psu.edu (10.0.1.32): 3000 data bytes
> 
> --- lion031g.hpc.cac.psu.edu ping statistics ---
> 2 packets transmitted, 0 packets received, 100% packet loss
> 
> If I drop the MTU to 1499, however, ping will work [other things still
> die.]
> 
> lion032g:~# ifconfig eth1
> eth1      Link encap:Ethernet  HWaddr 00:E0:B1:04:20:35
>           inet addr:10.0.1.33  Bcast:10.0.1.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1499  Metric:1
>           RX packets:3844617 errors:119 dropped:0 overruns:0 frame:119
>           TX packets:3835155 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           Interrupt:19
> 
> lion032g:~# ping -c 2 -s 3000 lion031g
> PING lion031g.hpc.cac.psu.edu (10.0.1.32): 3000 data bytes
> 3008 bytes from 10.0.1.32: icmp_seq=0 ttl=255 time=1.3 ms
> 3008 bytes from 10.0.1.32: icmp_seq=1 ttl=255 time=0.9 ms
> 
> --- lion031g.hpc.cac.psu.edu ping statistics ---
> 2 packets transmitted, 2 packets received, 0% packet loss
> round-trip min/avg/max = 0.9/1.1/1.3 ms
> 
> If I drop the MTU as far as 1400, I can run some of the standard MPI
> tests [PingPing, PingPong] successfully, but the performance isn't what
> it should be.
> 
> This was all with PacketEngines Powerrail 5300 Switch.  The same thing
> happens if we swap in an FDR.  The driver being used is the version 0.14
> found at http://www.nscl.msu.edu/~kasten/perf/hamachi/src/, not compiled
> for SMP [if I add the flags '-D__SMP__ -DCONFIG_X86_LOCAL_APIC', it
> compiles ok, but things died a lot and I don't have the error messages
> on me at the moment.]  Everything has been compiled with gcc 2.7.2.3.
> 
> So, has anyone else run across problems such as the one above?  If not,
> can you tell me what kernel and what version of the driver are you
> using?  If so, have you found a solution?
> 
> Thanks,
> 
> --
> Jason Holmes
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