Outgoing speed problems in -CURRENT (was: Re: SOLVED: Degraded TCP

[Andre Guibert de Bruet]

On Sat, 14 May 2005, Mike Jakubik wrote:
> On Sat, May 14, 2005 12:49 am, Andre Oppermann said:
>> Mike Jakubik wrote:
>
>>> I just tried your patch, but unfortunately it does not seem to affect
>>> my problem, the speeds are identical. I am still getting half the
>>> performance when sending out. The fact that this also occurs using
>>> another machine and a different card, leads me to belive something is
>>> broken in -CURRENT.
>>
>> net.inet.tcp.sendspace=65536  and try again.
>
> Im sorry, i mean to say receiving, not sending. I did try adjusting this,
> but it made no difference. Just to recap:
>
> netio server running windows xp, connecting from fbsd:
>
> TCP/IP connection established.
> Packet size  1 KByte:   41103 KByte/s
> Packet size  2 KByte:   39601 KByte/s
> Packet size  4 KByte:   43463 KByte/s
> Packet size  8 KByte:   43734 KByte/s
> Packet size 16 KByte:   43719 KByte/s
> Packet size 32 KByte:   43656 KByte/s
>
> netio server running on fbsd, connecting from windows xp:
>
> TCP/IP connection established.
> Packet size  1 KByte:   19347 KByte/s
> Packet size  2 KByte:   21056 KByte/s
> Packet size  4 KByte:   22845 KByte/s
> Packet size  8 KByte:   23445 KByte/s
> Packet size 16 KByte:   25082 KByte/s
> Packet size 32 KByte:   25294 KByte/s
>
> So as we can see, i am getting nearly half the performance when sending to
> the fbsd server. I get simillar results when substituting the windows
> server with a fbsd 5.4 server, and using 100mbit cards on both.

You surely must have meant 1000 Mbit cards. These numbers exceed the 
theoretical throughput of 100 Mbit networking (12500 KBytes/s).

Do the numbers differ significantly if you try this test between your 
CURRENT machine and say, a FreeBSD 4.x or Linux 2.6 machine?

Andy

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