STG is a very simple windows real time snmp grapher http://leonidvm.chat.ru/ It is geared at interface throughput but can easily be used for things like CPU utilization, firewall connection counts, temperature, etc. -----Original Message----- From: Joel Jaeggli [mailto:joelja@bogus.com] Sent: Friday, February 06, 2009 12:59 PM To: Deric Kwok Cc: nanog@nanog.org Subject: Re: Networking performance Deric Kwok wrote:
Hi
I would like to ask your professional experience about switch throughput
I have Gig Switchs eg: H P3400 /3500, cisco c4 948../ dlink In their spec, they said that it can handles Gig So far, I couldn't see their ports are used up over 200M in mrtg graph when I try to transfer 3G size files to files between computers
So, first off there's the question of sample interval vs the actaul time the transfer takes... I'd use an instrument other than mrtg to measure the spead of the transfer for example bytes transfer/wall clock time. Second, you're benchmarking a bunch of components other than the network, like your disks for example, which are likely slower than the 125MB/s you're trying to measure... Switch to ttcp or iperf for your throughput measurement and you'll probably get a lot closer to measuring what you're in fact trying to measure.
ls there any limitation in those switchs? or I have to do configuration eg: put it full duplex instead of auto
autonegotiation on gigabit interfaces should almost always produce the desired result.
Thank you for your help