Il 06/02/10 15:12, Claudio Jeker ha scritto:
quoted text
> On Sat, Feb 06, 2010 at 01:27:12PM +0100, Sebastiano Pomata wrote:
>> Il 06/02/10 03:55, Stuart Henderson ha scritto:
>>>> I really can understand this, for the sake of system portability and so
>>>> on. Anyway, I really hardly understand why, without touching any of the
>>>> default settings, download rate from every server would never overcome
>>>> the value of 400 kB/s. Is it all due to the tcp windows size?
>>>
>>> Yes.
>>>
>>
>> Thank you for the clear answer. Anyway, trying to act on tcp.sendspace
>> isn't affecting the upload capabilities of my OpenBSD server.
>> I tried downloading a file through httpd, via ftp but results are
>> still disappointing: 60-70 kbps between two boxes on the same switch.
>>
>> The box is going to become a webserver, could you please give me more
>> hints about tuning network performance?
>>
> 
> Check your links. This sounds like a full-duplex issue between switch and
> machines. On a LAN even with default tcp send/recvspace you should get
> easily get up to 200Mbps.
> 

Thank you all for the clear answers, when I'll get back to office on
monday I'll try to make more tests. Network equipment in the whole
room is 100Mbps, using CAT. 5 ethernet cables. How can I check if
network interfaces are tx/rx-ing in full duplex? via ifconfig?

Last thing: do Apache webserver need some arrangements to the default
settings to provide full bandwitdh to a stream?