Date: Wed, 26 Apr 2006 10:43:42 +0100 From: Chris Howells <howells@kde.org> To: freebsd-questions@freebsd.org Subject: Re: How to verify speed of a 1Gb/s network? Message-ID: <444F40CE.5090400@kde.org> In-Reply-To: <20060426031606.33136.qmail@web33302.mail.mud.yahoo.com> References: <20060426031606.33136.qmail@web33302.mail.mud.yahoo.com>
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Rob wrote: > How can I verify that a 1Gb/s network is indeed > operating at its optimal speed? I tried this: By transferring large amounts of data using a light-weight protocol (maybe FTP) and timing the amount of time it takes. Also various testing utilities, for instance ttcp. > [master]$ ping -s 65507 node > 65515 bytes from node: icmp_seq=0 ttl=64 time=1.97 ms > 65515 bytes from node: icmp_seq=1 ttl=64 time=1.95 ms > 65515 bytes from node: icmp_seq=2 ttl=64 time=1.94 ms > 65515 bytes from node: icmp_seq=3 ttl=64 time=1.97 ms This is a measure of latency only. For instance, I can easily get 10ms pings on 512kbit/sec ADSL. It can only transfer data at ~60 KB/sec though. I can get these values on a very lightly loaded 100Mbit/sec network: chris@merlin$ ping 10.0.0.5 PING 10.0.0.5 (10.0.0.5): 56 data bytes 64 bytes from 10.0.0.5: icmp_seq=0 ttl=128 time=0.844 ms 64 bytes from 10.0.0.5: icmp_seq=1 ttl=128 time=0.740 ms > PS: I verified my calculation method for two > computers here on a 100Mbit/s network, from which > I get: > time with ping: 12.4 ms > ideal calculated time: 10 ms Sounds like your 100Mbit/s network is very heavily loaded, you would expect ~1ms pings.
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