poor network performace of mec on R10000 O2

Hi,

I have an O2 running netbsd-5 branch with the following cpu

cpu0 at mainbus0: MIPS R10000 CPU (0x934) Rev. 3.4 with built-in FPU  
Rev. 0.0

When using the mec driver it frequently stalls, or at least the kb/s  
counter drops to 0, when doing any heavy lifting.

It just took me 1hr 50 mins to copy a gziped src archive from the  
machine next to it. That was just over 700mb, the little kb/s counter  
would shoot up to over 100kb/s then drop to 0 repeat until done. Its  
the same with ftp and building with sources on an nfs share.

When i previously ran 5.99.?? on this machine i got kernel warnings  
about interrupts, cant remember what they were but it was all the time.

does anyone have any ideas? i spoke to jmcneill about it and he thinks  
its the fact i have a R10K cpu.

I also see crime cpu error 4 messages occasionally

Sep 25 15:29:21 dribble /netbsd: crime: cpu error 4 at address 67548016
Sep 25 16:46:19 dribble /netbsd: crime: cpu error 4 at address 82680212
Sep 25 17:02:54 dribble /netbsd: crime: cpu error 4 at address 81361944

Thanks

Mark