On Tue, Feb 10, 2009 at 3:56 PM, (private) HKS <hks.private AT gmail DOT com> 
wrote:
> 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
>


I have discovered (what appears to be) a bug in OpenBSD's bnx(4)
driver that limits tx performance.

I don't *think* it's related to this problem: rx traffic performs
beautifully and the threshold (109Mb/s) is far above what I'm getting
with Bacula. I mention it in the interest of full disclosure.

-HKS

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