Sorry - Forgot to add: POP A -> POP B - only requires 8 sessions, but POP B -> POP A requires 25 sessions to achieve ~38Mb?
> From: [email protected] > To: [email protected]; [email protected] > Date: Tue, 2 Apr 2013 11:28:50 +1100 > CC: [email protected] > Subject: Re: [c-nsp] Performance issue on link > > Thanks Tony - With multiple sessions (8), I can achieve ~38Mb/sec > consistently. > > Is it simply not feasible to expect ~40Mb with a single tcp transfer (Without > significant adjustments to both Linux servers?) > > > > Date: Mon, 1 Apr 2013 17:10:42 -0700 > > From: [email protected] > > Subject: Re: [c-nsp] Performance issue on link > > To: [email protected]; [email protected] > > CC: [email protected] > > > > Try using multiple TCP sessions "iperf -P 5" (note - capital "P"). > > > > > > regards, > > Tony. > > > > > > > > > > > > ----- Original Message ----- > > > From: CiscoNSP List <[email protected]> > > > To: Azher Mughal <[email protected]> > > > Cc: "[email protected]" <[email protected]> > > > Sent: Tuesday, 2 April 2013 9:51 AM > > > Subject: Re: [c-nsp] Performance issue on link > > > > > >T hanks - Ill check them out now > > > > > >> Date: Mon, 1 Apr 2013 16:16:36 -0700 > > >> From: [email protected] > > >> To: [email protected] > > >> CC: [email protected] > > >> Subject: Re: [c-nsp] Performance issue on link > > >> > > >> These might be helpful: > > >> > > >> http://fasterdata.es.net/network-tuning/ > > >> > > >> > > > http://www.mellanox.com/related-docs/prod_software/Performance_Tuning_Guide_for_Mellanox_Network_Adapters.pdf > > >> > > >> -Azher > > >> > > >> On 4/1/2013 3:51 PM, CiscoNSP List wrote: > > >> > Hi, > > >> > > > >> > We have a 40Mb link between 2 POPs - Latency ~65m/sec (No packet-loss) > > >> > > > >> > POP A Is a 7301 and 2960POP B is a 7200 and 4948 > > >> > > > >> > 40Mb link is connected to the two switches (L2), and then a trunk > > >> link > > > to both routers for all L3. > > >> > > > >> > Have a Linux server connected to both switches, and achieve the > > > following performance: > > >> > > > >> > IPERF (UDP) > > >> > POP A -> POP B - 38.5Mb/secPOP B -> POP A - 38.5Mb/sec > > >> > > > >> > IPERF (TCP) > > >> > POP A -> POP B - ~20Mb/secPOP B -> POP A - ~12Mb/sec > > >> > > > >> > FTP > > >> > POP A -> POP B - ~38Mb/secPOP B -> POP A - ~16Mb/sec > > >> > > > >> > WGET > > >> > POP A -> POP B - ~30Mb/sec POP B -> POP A - ~16Mb/sec > > >> > > > >> > Any suggestions on why I am seeing poor performance with TCP > > > transfers? (Especially POP B -> POP A direction) - I've tried adjusting > > > the window size in IPERF but it actually made the results worse? > > >> > Thanks in advance. > > >> > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
