jumbo em

Yuriy N. Shkandybin jura at networks.ru
Thu Mar 16 11:11:00 UTC 2006


I have 2 freebsd servers connected by dedicated wire via em interfaces.
systems = 6.1-PRERELEASE #0: Tue Mar 14 11:58:23 MSK 2006

man em says
MTU size for Jumbo Frames is 16114 and i'm sure i've setup this on freebsd-5 and probably ealier 6.0
But now 
 ifconfig em1 mtu 16114
ifconfig: ioctl (set mtu): Invalid argument
16110 - max possible

Seems ok with mss 
13:59:36.590411 IP > S 3543827971:3543827971(0) win 65535 <mss 16070,nop,wscale 0,nop,nop,timestamp[|tcp]>
13:59:36.590462 IP > S 3003760814:3003760814(0) ack 3543827972 win 65535 <mss 16070,nop,wscale 0,nop,nop,timestamp[|tcp]>
seems jumbo working
983/652/1635 mbufs in use (current/cache/total)
908/410/1318/25600 mbuf clusters in use (current/cache/total/max)
908/329 mbuf+clusters out of packet secondary zone in use (current/cache)
0/0/0/0 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/0 9k jumbo clusters in use (current/cache/total/max)
0/0/0/0 16k jumbo clusters in use (current/cache/total/max)
2061K/983K/3044K bytes allocated to network (current/cache/total)
0/14496/3371 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
54/129/6656 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
23799 requests for I/O initiated by sendfile
107 calls to protocol drain routines

thereis empty info about jumbos. Is it ok?


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