From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David S. Ahern" <daahern@cisco.com>
Subject: Re: strange guest slowness after some time
Date: Tue, 31 Mar 2009 22:22:10 -0600
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Cc: Felix Leimbach <felix.leimbach@gmx.net>, avi@redhat.com,
	kvm@vger.kernel.org, Rusty Russell <rusty@rustcorp.com.au>,
	Anthony Liguori <anthony@codemonkey.ws>
To: Tomasz Chmielewski <mangoo@wpkg.org>
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Tomasz Chmielewski wrote:
> Felix Leimbach schrieb:
>> Tomasz Chmielewski wrote:
>>> Felix Leimbach schrieb:
>>>> Out of 3 e1000 guests none has ever been hit.
>>>>
>>>> Observed with kvm-83 and kvm-84 with the host running in-kernel KVM
>>>> code (linux 2.6.25.7)
>>> Could you add a (unused) e1000 interface to your virtio guests?
>>> As this issue happens rarely for me, maybe you could help to
>>> reproduce it as well (i.e. if network gets slow on virtio interface,
>>> give e1000 a IP address, and try if network is also slow on e1000 on
>>> the very same guest).
>> Will do and report
>>>
>>> BTW, what CPU do you have?
>> One dual core Opteron 2212
>> Note: I will upgrade to two Shanghai Quad-Cores in 2 weeks and test
>> with those as well.
> 
> I have this "slowness" on an Intel CPU as well, after about 10 days of
> guest uptime (using virtio net):
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Xeon(R) CPU            3050  @ 2.13GHz
> stepping        : 6
> cpu MHz         : 2133.410
> cache size      : 2048 KB
> physical id     : 0
> siblings        : 2
> core id         : 1
> cpu cores       : 2
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 10
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> syscall lm constant_tsc arch_perfmon pebs bts rep_good pni monitor
> ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4266.87
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> 

For the Intel server, the guest is using the e1000 NIC or virtio or
other? I have a few DL320G5s with this processor; I have not hit this
problem running rhel3 and rhel4 guests using e1000/scsi devices.

david