domU page faults under heavy network load

[Kip Macy]

How big is the memory allocation to the VM?

Thanks,
Kip


On Tue, Feb 10, 2009 at 7:59 AM, Kai Mosebach <xen at 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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