From: Avi Kivity <avi@qumranet.com>
To: Alexander Graf <alex@csgraf.de>
Cc: kvm-ppc-devel <kvm-ppc-devel@lists.sourceforge.net>,
Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>,
Hollis Blanchard <hollisb@us.ibm.com>,
kvm-devel <kvm-devel@lists.sourceforge.net>
Subject: Re: [kvm-ppc-devel] [kvm-devel] virtio-net working on PowerPC KVM
Date: Mon, 31 Mar 2008 08:28:11 +0000 [thread overview]
Message-ID: <47F0A09B.80601@qumranet.com> (raw)
In-Reply-To: <43AD5B7C-7EF8-462C-B44C-178F89DE28D5@csgraf.de>
Alexander Graf wrote:
>
> On Mar 31, 2008, at 9:43 AM, Avi Kivity wrote:
>
>> Alexander Graf wrote:
>>>
>>> I am experiencing 7-8ms ping latencies (native 0.1ms) on x86_64 as
>>> well, when pinging the virtual machine. Maybe it's not related to
>>> PowerPC? Is it supposed to be that slow?
>>
>> If you have a really old host kernel, or a misconfigured one, it can
>> happen. What's your host kernel? are you using hrtimers?
>
> This is a 2.6.22 SUSE kernel. As far as I can see
> CONFIG_HIGH_RES_TIMERS is not set.
>
An alternative is -clock hpet or -clock rtc.
> Guess it's my fault then - nevertheless a warning when starting kvm
> would be nice.
Yes, indeed.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@qumranet.com>
To: Alexander Graf <alex@csgraf.de>
Cc: kvm-ppc-devel <kvm-ppc-devel@lists.sourceforge.net>,
Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>,
Hollis Blanchard <hollisb@us.ibm.com>,
kvm-devel <kvm-devel@lists.sourceforge.net>
Subject: Re: [kvm-ppc-devel] virtio-net working on PowerPC KVM
Date: Mon, 31 Mar 2008 11:28:11 +0300 [thread overview]
Message-ID: <47F0A09B.80601@qumranet.com> (raw)
In-Reply-To: <43AD5B7C-7EF8-462C-B44C-178F89DE28D5@csgraf.de>
Alexander Graf wrote:
>
> On Mar 31, 2008, at 9:43 AM, Avi Kivity wrote:
>
>> Alexander Graf wrote:
>>>
>>> I am experiencing 7-8ms ping latencies (native 0.1ms) on x86_64 as
>>> well, when pinging the virtual machine. Maybe it's not related to
>>> PowerPC? Is it supposed to be that slow?
>>
>> If you have a really old host kernel, or a misconfigured one, it can
>> happen. What's your host kernel? are you using hrtimers?
>
> This is a 2.6.22 SUSE kernel. As far as I can see
> CONFIG_HIGH_RES_TIMERS is not set.
>
An alternative is -clock hpet or -clock rtc.
> Guess it's my fault then - nevertheless a warning when starting kvm
> would be nice.
Yes, indeed.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
-------------------------------------------------------------------------
Check out the new SourceForge.net Marketplace.
It's the best place to buy or sell services for
just about anything Open Source.
http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace
next prev parent reply other threads:[~2008-03-31 8:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-28 22:33 [kvm-ppc-devel] virtio-net working on PowerPC KVM Hollis Blanchard
2008-03-28 22:33 ` Hollis Blanchard
2008-03-29 9:04 ` [kvm-ppc-devel] " Zhang Wei
2008-03-29 9:04 ` Zhang Wei
2008-03-30 10:31 ` [kvm-ppc-devel] [kvm-devel] " Avi Kivity
2008-03-30 10:31 ` Avi Kivity
2008-03-31 4:52 ` [kvm-ppc-devel] [kvm-devel] " Christian Ehrhardt
2008-03-31 4:52 ` [kvm-ppc-devel] " Christian Ehrhardt
2008-03-31 7:45 ` [kvm-ppc-devel] [kvm-devel] " Alexander Graf
2008-03-31 7:45 ` [kvm-ppc-devel] " Alexander Graf
2008-03-31 7:43 ` [kvm-ppc-devel] [kvm-devel] " Avi Kivity
2008-03-31 7:43 ` [kvm-ppc-devel] " Avi Kivity
2008-03-31 8:17 ` [kvm-ppc-devel] [kvm-devel] " Alexander Graf
2008-03-31 8:17 ` [kvm-ppc-devel] " Alexander Graf
2008-03-31 8:28 ` Avi Kivity [this message]
2008-03-31 8:28 ` Avi Kivity
2008-03-31 9:09 ` [kvm-ppc-devel] [kvm-devel] " Dor Laor
2008-03-31 9:09 ` [kvm-ppc-devel] " Dor Laor
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