Re: scp performance

[Brad <brad%comstyle.com@localhost>]

On Thursday 17 January 2008 14:47:25 Aaron Turner wrote:
> On Jan 17, 2008 9:12 AM, comfooc <comfooc%gmail.com@localhost> wrote:
> > Hi,
> > few weeks ago i made some test using scp.
> > Systems were out of the box.
> > Machine 1 : OpenBSD; P3 500Mhz; 192Mram; 10Mbps;
> > Machine 2 : tripleboot :OpenBSD, Linux, NetBSD; P3 750Mhz, 512Mram, 100Mbps;
> >
> > Transfers were:
> > Machine 1 <=average 800KBps=> Machine 2 : Linux
> > Machine 1 <=average 550KBps=> Machine 2 : NetBSD
> > Machine 1 <=average 950KBps=> Machine 2 : OpenBSD
> >
> > What might caused that low transfer? How to improve it?
> > Cheers...
> 
> Machine #1 has a 10Mbps NIC?  950KBps is ~ 7.4Mbps.  Considering
> 10Mbps is 1/2 duplex, and considering TCP overhead, etc I can't say
> I'm all that shocked your performance sucks.

That is an assumption that 10Mbps is half duplex.

He was asking why the system running NetBSD performs quite a bit worse
then when running the same system with OpenBSD or Linux.

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.