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/
