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 ls there any limitation in those switchs? or I have to do configuration eg: put it full duplex instead of auto Thank you for your help
Make sure MRTG is using SNMPv2 when it does its data gathering otherwise you'll suffer from counter rollover. -----Original Message----- From: Deric Kwok [mailto:deric.kwok2000@gmail.com] Sent: Friday, February 06, 2009 1:44 PM To: nanog@nanog.org Subject: Networking performance 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 ls there any limitation in those switchs? or I have to do configuration eg: put it full duplex instead of auto Thank you for your help This e-mail message and any files transmitted with it contain confidential information intended only for the person(s) to whom this email message is addressed. If you have received this e-mail message in error, please notify the sender immediately by telephone or e-mail and destroy the original message without making a copy. Thank you. Neither this information block, the typed name of the sender, nor anything else in this message is intended to constitute an electronic signature unless a specific statement to the contrary is included in this message.
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
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
On Feb 6, 2009, at 1:43 PM, Deric Kwok wrote:
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
ls there any limitation in those switchs?
Those switches do more than 200 Mbps. (BTW, Are you measuring megaBITs or megaBYTES?) I suspect the machines transfering data, not the switches. -- TTFN, patrick
participants (5)
-
Deric Kwok -
Joel Jaeggli -
Justin Krejci -
Mills, Charles -
Patrick W. Gilmore