Thanks for the suggestion. I tried with the netperf. I ran netserver on host and netperf on RHEL 5.5 and RHEL 4.5 guests. This are the results of 60 seconds long tests: RHEL 4.5 guest: Throughput (10^6bits/sec) = 145.80 RHEL 5.5 guest: Throughput (10^6bits/sec) = 3760.24 The results are really bad on RHEL 4.5 guest. What could be wrong? Regards, Alex On Mon, Aug 16, 2010 at 9:49 PM, Dor Laor <dlaor@xxxxxxxxxx> wrote: > On 08/16/2010 10:00 PM, Alex Rixhardson wrote: >> >> Hi guys, >> >> I have the following configuration: >> >> 1. host is RHEL 5.5, 64bit with KVM (version that comes out of the box >> with RHEL 5.5) >> 2. two guests: >> 2a: RHEL 5.5, 32bit, >> 2b: RHEL 4.5, 64bit >> >> If I run iperf between host RHEL 5.5 and guest RHEL 5.5 inside the >> virtual network subnet I get great results (> 4Gbit/sec). But if I run >> iperf between guest RHEL 4.5 and either of the two RHELs 5.5 I get bad >> network performance (around 140Mbit/sec). > > Please try netperf, iperf known to be buggy and might consume cpu w/o real > justification > >> >> The configuration was made thru virtual-manager utility, nothing >> special. I just added virtual network device to both guests. >> >> Could you guys give me some tips on what should I check? >> >> Regards, >> Alex >> -- >> To unsubscribe from this list: send the line "unsubscribe kvm" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
