TCP/UDP cksum offload on hme(4)

[Tillman Hodgson]

On Thu, Jun 17, 2004 at 03:49:35PM +0900, Pyun YongHyeon wrote:
> I can't saturate the wire with/without my patch.(For TCP without
> witness it was about 67Mbps. On OpenBSD I got about 93Mbps.)
> I vaguely guess the reason was caused by hme's lack of
> auto-negotiation.

That seems odd to me ... on my Ultra 5 (with 5 hme ports) running
-current as of April 16, I recently ran some IPsec vs clear transmission
tests:

Ultra 5, clear transmission:
[root at caliban /usr/local/netperf]# ./netperf -t UDP_STREAM -H athena
UDP UNIDIRECTIONAL SEND TEST to athena : histogram
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec
  9216    9216   10.01       13004  13160      95.81
 42080           10.01       12778             94.14

Ultra 5, with 3des:
[root at caliban /usr/local/netperf]# ./netperf -t UDP_STREAM -H secathena
UDP UNIDIRECTIONAL SEND TEST to secathena : histogram
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec
  9216    9216   10.01         715      0       5.27
 42080           10.01         713              5.25

Ultra 5n, with blowfish:
[root at caliban ~]#  /usr/local/netperf/netperf -t UDP_STREAM -H secathena
UDP UNIDIRECTIONAL SEND TEST to secathena : histogram
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec
  9216    9216   10.01       14744      0     108.63
 42080           10.01        3681             27.12

(108, greater than 100mbit max, is due to using 'deflate' compression
 algorithm)

(Oh, and the moral of the story is that blowfish rocks when usign IPsec
 in transport mode :-))

This was testing a UDP stream (simulating my UDP NFS exports) to an x86
NFS file server runing -STABLE with the a gigabit interface. They were
connected through a D-link 1026G switch, and auto-negotiation was used.

-T


-- 
Zen is the unsymbolization of the world.
	R.H. Blyth