Date: Wed, 26 Apr 2006 11:59:41 +0200 From: "Daniel A." <ldrada@gmail.com> To: "Chris Howells" <howells@kde.org> Cc: freebsd-questions@freebsd.org Subject: Re: How to verify speed of a 1Gb/s network? Message-ID: <5ceb5d550604260259y6d663228p5e85518a73f8bc4c@mail.gmail.com> In-Reply-To: <444F40CE.5090400@kde.org> References: <20060426031606.33136.qmail@web33302.mail.mud.yahoo.com> <444F40CE.5090400@kde.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 4/26/06, Chris Howells <howells@kde.org> wrote: > 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=3D0 ttl=3D64 time=3D1.97 ms > > 65515 bytes from node: icmp_seq=3D1 ttl=3D64 time=3D1.95 ms > > 65515 bytes from node: icmp_seq=3D2 ttl=3D64 time=3D1.94 ms > > 65515 bytes from node: icmp_seq=3D3 ttl=3D64 time=3D1.97 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=3D0 ttl=3D128 time=3D0.844 ms > 64 bytes from 10.0.0.5: icmp_seq=3D1 ttl=3D128 time=3D0.740 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. Please notice that he is transferring 65515 bytes, not 64 (Like you did)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5ceb5d550604260259y6d663228p5e85518a73f8bc4c>