From: Dor Laor <dlaor@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Sven Rudolph <Sven_Rudolph@drewag.de>,
kvm@vger.kernel.org, "Roedel, Joerg" <Joerg.Roedel@amd.com>
Subject: Re: Windows 2003: ping -n doesn't wait
Date: Sat, 24 Jan 2009 01:53:46 +0200 [thread overview]
Message-ID: <497A588A.40209@redhat.com> (raw)
In-Reply-To: <20090123205512.GA3911@amt.cnet>
Marcelo Tosatti wrote:
> On Tue, Jan 20, 2009 at 03:53:06PM +0100, Sven Rudolph wrote:
>
>> Hello,
>>
>> first the facts required by bug reporting guidelines:
>>
>> - two Quad-Core AMD Opteron(tm) Processors 2352
>> - kvm-83 (both kernel and userland)
>> - Host kernel: 2.6.28.1, x86_64
>> - guest:
>> - 4 CPUs assigned to this guest (-smp 4)
>> - Microsoft Windows 2003 Server, Standard Edition, Service Pack 2
>> - qemu command line:
>> qemu-system-x86_64 -m 4096 -boot c -hda hda.dat -smp 4 \
>> -net nic,macaddr=00:50:56:24:0b:37,model=virtio \
>> -net tap,ifname=vm03,script=no,downscript=no
>>
>> The problem: When running "ping -n 3 localhost" on the guest it should
>> wait one second between each ping request and the time needed should
>> be non-negative and below 10 ms. Instead, ping does not actually wait
>> between sending the packets, and the time for the requests ist often
>> displayed to be too large or negative. Simple examples:
>>
>> [WinNT] ping -n 3 localhost
>>
>> Ping wird ausgefhrt fr localhost [127.0.0.1] mit 32 Bytes Daten:
>>
>> Antwort von 127.0.0.1: Bytes=32 Zeit=-465ms TTL=128
>> Antwort von 127.0.0.1: Bytes=32 Zeit=-613ms TTL=128
>> Antwort von 127.0.0.1: Bytes=32 Zeit=-465ms TTL=128
>>
>
> Sven, Dor,
>
> Can you try to use the AMD CPU drivers for Windows?
>
> Take a look at http://forums.citrix.com/thread.jspa?threadID=93813
>
> http://www.therightstuff.de/2007/06/05/The-Case-Of-The-Negative-Ping.aspx
>
> I don't doubt the KVM tsc syncing code for AMD is not involved, though.
>
>
Installing AMD's driver for powerNow solves this issue.
Joerg, can you please supply us some explanations?
Thanks,
Dor
> --
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>
next prev parent reply other threads:[~2009-01-23 23:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-20 14:53 Windows 2003: ping -n doesn't wait Sven Rudolph
2009-01-21 14:05 ` Dor Laor
2009-01-23 16:45 ` Marcelo Tosatti
2009-01-23 20:55 ` Marcelo Tosatti
2009-01-23 23:53 ` Dor Laor [this message]
2009-01-26 17:09 ` Sven Rudolph
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