RHEL 4.5 guest virtual network performace

RHEL 4.5 guest virtual network performace

[Alex Rixhardson]

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).

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

Re: RHEL 4.5 guest virtual network performace

[Dor Laor]

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@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: RHEL 4.5 guest virtual network performace

[Alex Rixhardson]

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@redhat.com> 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@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>

Re: RHEL 4.5 guest virtual network performace

[Dor Laor]

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@redhat.com>  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@vger.kernel.org
>>> 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@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: RHEL 4.5 guest virtual network performace

[Alex Rixhardson]

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.

On Mon, Aug 16, 2010 at 11:35 PM, Dor Laor <dlaor@redhat.com> 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@redhat.com>  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@vger.kernel.org
>>>> 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@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>

Re: RHEL 4.5 guest virtual network performace

[Dor Laor]

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@redhat.com>  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@redhat.com>    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@vger.kernel.org
>>>>> 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@vger.kernel.org
>>> 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@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: RHEL 4.5 guest virtual network performace

[Alex Rixhardson]

virtio...I think :-).

How could I confirm that?

Regards,
Alex

On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor <dlaor@redhat.com> 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@redhat.com>  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@redhat.com>    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@vger.kernel.org
>>>>>> 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@vger.kernel.org
>>>> 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@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>

Re: RHEL 4.5 guest virtual network performace

[Alex Rixhardson]

Thank you a lot for the tip - you were right. The 5.5 guest is using
virtio, but 4.5 is not. So, this is the reason.

Adding <model type='virtio' /> to the config file unfortunately
doesn't help - the network card is not recognized by the guest. Do I
need to install something extra on the guest RHEL 4.5?

Regards,
Alex

On Tue, Aug 17, 2010 at 12:05 AM, Alex Rixhardson
<alexrixhardson@gmail.com> wrote:
> virtio...I think :-).
>
> How could I confirm that?
>
> Regards,
> Alex
>
> On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor <dlaor@redhat.com> 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@redhat.com>  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@redhat.com>    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@vger.kernel.org
>>>>>>> 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@vger.kernel.org
>>>>> 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@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>>
>

Re: RHEL 4.5 guest virtual network performace

[David S. Ahern]

On 08/16/10 17:09, Alex Rixhardson wrote:
> Thank you a lot for the tip - you were right. The 5.5 guest is using
> virtio, but 4.5 is not. So, this is the reason.
> 
> Adding <model type='virtio' /> to the config file unfortunately
> doesn't help - the network card is not recognized by the guest. Do I
> need to install something extra on the guest RHEL 4.5?

RHEL4.8 is the first RHEL4 version to support virtio devices.

David


> 
> Regards,
> Alex
> 
> On Tue, Aug 17, 2010 at 12:05 AM, Alex Rixhardson
> <alexrixhardson@gmail.com> wrote:
>> virtio...I think :-).
>>
>> How could I confirm that?
>>
>> Regards,
>> Alex
>>
>> On Mon, Aug 16, 2010 at 11:56 PM, Dor Laor <dlaor@redhat.com> 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@redhat.com>  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@redhat.com>    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@vger.kernel.org
>>>>>>>> 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@vger.kernel.org
>>>>>> 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@vger.kernel.org
>>>> 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@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>