em0 performance subpar

[Adam Stylinski]

On Thu, Apr 28, 2011 at 04:29:42PM +0100, Steven Hartland wrote:
> Try using a large buffer size on iperf and check the flow control options on the switch.
> 
> ----- Original Message ----- 
> From: "Adam Stylinski" <kungfujesus06 at gmail.com>
> Just using the default settings with iperf.  Netblast is giving me similar results.  Disabling TCP checksum offloading (transmit 
> and receive) and large receive offload have zero effect.
> 
> -- 
> Adam Stylinski
> PGP Key: http://pohl.ececs.uc.edu/~adam/publickey.pub
> Blog: http://technicallyliving.blogspot.com
> 
> 
> 
> 
> ================================================
> This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 
> 
> In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337
> or return the E.mail to postmaster at multiplay.co.uk.
> 

[adam at nasbox ~]$ iperf -m -w 1677216 -l1M -c 192.168.0.121
------------------------------------------------------------
Client connecting to 192.168.0.121, TCP port 5001
TCP window size: 1.60 MByte (WARNING: requested 1.60 MByte)
------------------------------------------------------------
[  3] local 192.168.0.60 port 24761 connected with 192.168.0.121 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   694 MBytes   581 Mbits/sec
[  3] MSS size 8192 bytes (MTU 8232 bytes, unknown interface)

Switch is unmanaged, options are non-existent.

-- 
Adam Stylinski
PGP Key: http://pohl.ececs.uc.edu/~adam/publickey.pub
Blog: http://technicallyliving.blogspot.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 834 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-net/attachments/20110428/6212d654/attachment.pgp