virtio...I think :-). How could I confirm that? Regards, Alex On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor <dlaor@xxxxxxxxxx> wrote: > On 08/17/2010 12:51 AM, Alex Rixhardson wrote: >> >> I tried with 'notsc divider=10' (since it's 64 bit guest), but the >> results are the still same :-(. The guest is idle at the time of >> testing. It has 2 CPU and 1024 MB RAM available. > > Hmm, are you using e1000 or virtio for the 4.5 guest? > e1000 should be slow since it's less suitable for virtualization (3 > mmio/packet) > > >> >> On Mon, Aug 16, 2010 at 11:35 PM, Dor Laor<dlaor@xxxxxxxxxx> wrote: >>> >>> On 08/17/2010 12:22 AM, Alex Rixhardson wrote: >>>> >>>> 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 >>> >>> At least it bought you another 5Mb/s over iperf ... >>> >>> It might be time related, 5.5 has kvmclock but rhel4 does not. >>> If it's 64 bit guest add this to the 4.5 guest cmdline 'notsc >>> divider=10'. >>> If it's 32 use 'clock=pmtmr divider=10'. >>> The divider is probably new and is in rhel4.8 only, it's ok w/o it too. >>> >>> What's the host load for the 4.5 guest? >>> >>>> >>>> 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 >>> >>> >> -- >> 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
