Re: maximum data rates

["Paul Hyder" <Paul.Hyder --at-- noaa.gov>]

Would need to know which operating system and the CPU speed of the "...two PCs." to
help much.

It is indeed not difficult to get single flows to over 90% of a GigE but you probably
need to tune buffers a bit.  (e.g. On a dual 2.0GHz Opteron hardware with Linux.)  If
you run Linux I can provide details of what to modify. For Windows and others see the
PSC url below.
   Paul Hyder
   NOAA Forecast Systems Lab

Synopsis:
   General TCP tuning: http://www.psc.edu/networking/projects/tcptune/
   Internet2 iperf/bwctl TCP Throughput: http://abilene.internet2.edu/ami/bwctl_status.cgi/TCP/now

Jason wrote:
> I can only manage to achieve 229Mbps on 1Gbps link using a gigabit hub in between two PCs. Any idea to increase the volume of traffic?
>
> "Cottrell, Les" <cottrell --at-- SLAC.Stanford.EDU> wrote:You can get around 960Mbps with iperf on a  back to back 1Gbps link between two PCs.  On a 10Gbps link one can get about 7.5Gbps, the limitation is the PCI-X bus.
>
>
> ---------------------------------
> From: owner-iperf-users --at-- dast.nlanr.net [mailto:owner-iperf-users --at-- dast.nlanr.net] On Behalf Of Jason
> Sent: Tuesday, May 24, 2005 12:09 AM
> To: Iperf Users
> Subject: maximum data rates
>
>
>
> Dear all,
>  
>  I try iperf on 100 Mbps link & it is able to generate tcp traffic up to 97 Mbps. Any one try on Gigabit link & what is the maximum data traffic it can generate? Also, any one using web100 with iperf, because I think Iperf alone can generate near 100 Mbps & I am not too sure what web100 uses are.
>  
> Thanks
>
>
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