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Date: Tue, 10 Feb 2009 20:40:05 +0100
From: Kai Mosebach <kai@freshx.de>
To: Kip Macy <kmacy@freebsd.org>,
	Kai Mosebach <xen@komadev.de>
Message-ID: <C5B796A5.3A80%kai@freshx.de>
Thread-Topic: domU page faults under heavy network load
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Cc: freebsd-xen <freebsd-xen@freebsd.org>
Subject: Re: domU page faults under heavy network load
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1024meg


On 2/10/09 8:30 PM, "Kip Macy" <kmacy@freebsd.org> wrote:

> How big is the memory allocation to the VM?
> 
> Thanks,
> Kip
> 
> 
> On Tue, Feb 10, 2009 at 7:59 AM, Kai Mosebach <xen@komadev.de> wrote:
>> Hi,
>> 
>> running r188436M on Xen3.3.1 (Centos5, x86_64). The reason is not to clear
>> but seems related to heavy load on pipes + memory + network?
>> It is repeatable with :
>> 
>> bsd8# dd if=/dev/zero | nc otherhost 12345
>> 
>> Fatal trap 12: page fault while in kernel mode
>> cpuid = 0; apic id = 00
>> fault virtual address   = 0xd216dd00
>> fault code              = supervisor read, page not present
>> instruction pointer     = 0x21:0xc02e4d40
>> stack pointer           = 0x29:0xc332aba8
>> frame pointer           = 0x29:0xc332abfc
>> code segment            = base 0x0, limit 0xfffff, type 0x1b
>>                        = DPL 1, pres 1, def32 1, gran 1
>> processor eflags        = interrupt enabled, resume, IOPL = 0
>> current process         = 12 (irq137: xn)
>> [thread pid 12 tid 100025 ]
>> Stopped at      xlvbd_add+0x2f70:       movl    0x900(%edx,%eax,4),%edx
>> db> bt
>> <console hangs>
>> 
>> 
>> On otherhost i get some stuff (between 19 and 62 MB), after nc closes down
>> eventually
>> 
>> otherhost# nc -l 12345 | cpipe -vt -b 65535 >/dev/null
>> ...
>> thru: 108930.791ms at  184.3kB/s ( 184.3kB/s avg)   19.6MB
>> 
>> best Kai
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