On Tue, Feb 10, 2009 at 1:04 PM, Steve Polyack <korvus AT comcast DOT net> 
wrote:
> (private) HKS wrote:
>>
>> My server's network performance seems all right. Testing basic TCP
>> throughput with iperf, I'm showing an average of 880Mbps or so. FTP
>> downloads to this server hum along at about 85MB/s.
>>
>>
>
> You may want to expirement with the "Maximum Network Buffer Size" parameter
> which is available in both the file-daemon and storage-daemon configuration
> files. As far as the documentation explains, the SD's default is 32768 bytes
> while the FD default is 65536 bytes.  I'm not sure what the reason is for
> the difference, but I would try setting them both to either 32768 or 65536.
>  Perhaps try larger values, but stay under the limits of your OS's TCP
> send/recv buffers (256k s/r on FreeBSD 7).
>

Thanks for the recommendation. I've changed this around a bit, but
haven't seen any change. I also haven't been able to replicate this
poor performance through any other method of writing to disk,
transferring across the network, or some combination of the two. I'm
certainly open to doing tests on this if only I knew what to do.

-HKS

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