Date: Tue, 10 Feb 2009 16:59:33 +0100 (CET) From: Kai Mosebach <xen@komadev.de> To: freebsd-xen <freebsd-xen@freebsd.org> Subject: domU page faults under heavy network load Message-ID: <13732317.41351234281573360.JavaMail.root@zim.freshx.de> In-Reply-To: <17604735.41331234281418189.JavaMail.root@zim.freshx.de>
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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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