Re: How to verify speed of a 1Gb/s network?
Mike Tancsa wrote: On Tue, 25 Apr 2006 20:16:06 -0700 (PDT), in sentex.lists.freebsd.questions you wrote: Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: There are some useful tools in /usr/src/tools/tools/netrate/ to generate a lot of traffic. Also, /usr/ports/benchmarks/iperf I'll second the iperf vote. That's definitely the way to go. ---Mike Mike Tancsa, Sentex communications http://www.sentex.net Providing Internet Access since 1994 [EMAIL PROTECTED], (http://www.tancsa.com) ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] -- Regards, Eric ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
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: [EMAIL PROTECTED] 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. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On 4/26/06, Rob [EMAIL PROTECTED] wrote: Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: [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 (I tried many times, over a long period of time to get these typical values). From this I conclude that it takes about 1.95 ms for 65515 x 8 bits to go forth and back between master and node. Ideally, on a 1Gbit/s network, the time should be: 65515 x 8 x 2 / (10243) = 0.98 ms (x 2 for the roundtrip signal forth and back and 10243 is the 1G of the network) Nopes. There's a number of 10Gig+ lines where you can't get less than 100ms, damn the light speed :-) ICMP echo service is pretty much always the lowest priority of any host. I get 2000ms+ rtt from cheap d-link devices on a gigabit network. I get 500ms+ from $10k cisco switches on any networks. Use iperf or other such tools for real testing. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On Tuesday 25 April 2006 23:17, Chad Leigh -- Shire.Net LLC wrote: On Apr 25, 2006, at 9:16 PM, Rob wrote: Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: [master]$ 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 (I tried many times, over a long period of time to get these typical values). From this I conclude that it takes about 1.95 ms for 65515 x 8 bits to go forth and back between master and node. Ideally, on a 1Gbit/s network, the time should be: 65515 x 8 x 2 / (10243) = 0.98 ms (x 2 for the roundtrip signal forth and back and 10243 is the 1G of the network) May I now conclude that the real-time is about two times the ideal-time? I wonder if this indicates a problem of the network? And is this a proper test of this Gbit/s network? Thanks, Rob. 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 which is an acceptable difference I would suspect that a ping is not a valid test as it does not test throughput and the send and reception phases have a large influence on the out come. Ie, the time for the send and reception to take place is long enough compared to the fast network that the results are skewed. Try an ftp or other non-encrypted data transfer with a large enough file that the startup and wind-down won't affect and skew it. Probably still not a definitive test btw, here is a test of my gbit network using your ping test 15 packets transmitted, 15 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.128/0.227/0.342/0.061 ms a few years back, i had a gigabit fiber switch, and 2 intel gigabit fiber cards that i put in my 2 fastest computers (at the time, dual p3 1000 and dual p3 933). they both had 10k rpm ultra160 SCSI drives. the fastest i could get for continuous transfer (i made some gigantic zip files containing several .iso files) was about 250mbit. jonathan ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On 4/26/06, Jonathan Horne [EMAIL PROTECTED] wrote: a few years back, i had a gigabit fiber switch, and 2 intel gigabit fiber cards that i put in my 2 fastest computers (at the time, dual p3 1000 and dual p3 933). they both had 10k rpm ultra160 SCSI drives. the fastest i could get for continuous transfer (i made some gigantic zip files containing several .iso files) was about 250mbit. No wonder, really. I bet that hard drives were the bottleneck. Today 2-3 cheap SATA drives can easily saturate gigabit links. And if you enable jumbo frames, then CPU will be idle on large file transfers. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On 4/26/06, Chris Howells [EMAIL PROTECTED] 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=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: [EMAIL PROTECTED] 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. Please notice that he is transferring 65515 bytes, not 64 (Like you did) ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On Tue, 25 Apr 2006 20:16:06 -0700 (PDT), in sentex.lists.freebsd.questions you wrote: Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: There are some useful tools in /usr/src/tools/tools/netrate/ to generate a lot of traffic. Also, /usr/ports/benchmarks/iperf ---Mike Mike Tancsa, Sentex communications http://www.sentex.net Providing Internet Access since 1994 [EMAIL PROTECTED], (http://www.tancsa.com) ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
How to verify speed of a 1Gb/s network?
Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: [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 (I tried many times, over a long period of time to get these typical values). From this I conclude that it takes about 1.95 ms for 65515 x 8 bits to go forth and back between master and node. Ideally, on a 1Gbit/s network, the time should be: 65515 x 8 x 2 / (10243) = 0.98 ms (x 2 for the roundtrip signal forth and back and 10243 is the 1G of the network) May I now conclude that the real-time is about two times the ideal-time? I wonder if this indicates a problem of the network? And is this a proper test of this Gbit/s network? Thanks, Rob. 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 which is an acceptable difference. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to verify speed of a 1Gb/s network?
On Apr 25, 2006, at 9:16 PM, Rob wrote: Hi, How can I verify that a 1Gb/s network is indeed operating at its optimal speed? I tried this: [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 (I tried many times, over a long period of time to get these typical values). From this I conclude that it takes about 1.95 ms for 65515 x 8 bits to go forth and back between master and node. Ideally, on a 1Gbit/s network, the time should be: 65515 x 8 x 2 / (10243) = 0.98 ms (x 2 for the roundtrip signal forth and back and 10243 is the 1G of the network) May I now conclude that the real-time is about two times the ideal-time? I wonder if this indicates a problem of the network? And is this a proper test of this Gbit/s network? Thanks, Rob. 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 which is an acceptable difference I would suspect that a ping is not a valid test as it does not test throughput and the send and reception phases have a large influence on the out come. Ie, the time for the send and reception to take place is long enough compared to the fast network that the results are skewed. Try an ftp or other non-encrypted data transfer with a large enough file that the startup and wind-down won't affect and skew it. Probably still not a definitive test btw, here is a test of my gbit network using your ping test 15 packets transmitted, 15 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.128/0.227/0.342/0.061 ms --- Chad Leigh -- Shire.Net LLC Your Web App and Email hosting provider chad at shire.net ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
