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[Qemu-devel] [Bug 1091241] [NEW] NetBSD/i386 6.0 guest suffers interrupt
From: |
Andreas Gustafsson |
Subject: |
[Qemu-devel] [Bug 1091241] [NEW] NetBSD/i386 6.0 guest suffers interrupt storm since qemu BIOS update |
Date: |
Mon, 17 Dec 2012 14:15:46 -0000 |
Public bug reported:
Since the pc-bios update of qemu commit
d7a51dbbaa70677846453f8c961590913052dd86, booting a NetBSD/i386 guest
takes a very long time, apparently due to interrupt load.
For example, booting the NetBSD/i386 6.0 serial console install CD with
wget
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-6.0/i386/installation/cdrom/boot-com.iso
qemu-system-i386 -nographic -cdrom boot-com.iso
used to take less than a minute, but now takes more like ten minutes to
enter the "sysinst" installer; it's so slow that at first I thought it
had hung. If I then exit the installer and type "vmstat -i", it shows a
high interrupt rate on ioapic0 pin 9:
# vmstat -i
interrupt total rate
cpu0 timer 336942 102
ioapic0 pin 9 256791232 78052
ioapic0 pin 1 1 0
ioapic0 pin 15 345 0
ioapic0 pin 4 102 0
ioapic0 pin 6 1 0
Total 257128623 78154
According to dmesg, this is the piixpm0 device:
# dmesg
[...]
piixpm0 at pci0 dev 1 function 3: vendor 0x8086 product 0x7113 (rev. 0x03)
timecounter: Timecounter "piixpm0" frequency 3579545 Hz quality 1000
piixpm0: 24-bit timer
piixpm0: interrupting at ioapic0 pin 9
[...]
Versions of qemu lacking commit d7a51dbbaa70677846453f8c961590913052dd86
do not have this problem.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1091241
Title:
NetBSD/i386 6.0 guest suffers interrupt storm since qemu BIOS update
Status in QEMU:
New
Bug description:
Since the pc-bios update of qemu commit
d7a51dbbaa70677846453f8c961590913052dd86, booting a NetBSD/i386 guest
takes a very long time, apparently due to interrupt load.
For example, booting the NetBSD/i386 6.0 serial console install CD
with
wget
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-6.0/i386/installation/cdrom/boot-com.iso
qemu-system-i386 -nographic -cdrom boot-com.iso
used to take less than a minute, but now takes more like ten minutes
to enter the "sysinst" installer; it's so slow that at first I thought
it had hung. If I then exit the installer and type "vmstat -i", it
shows a high interrupt rate on ioapic0 pin 9:
# vmstat -i
interrupt total rate
cpu0 timer 336942 102
ioapic0 pin 9 256791232 78052
ioapic0 pin 1 1 0
ioapic0 pin 15 345 0
ioapic0 pin 4 102 0
ioapic0 pin 6 1 0
Total 257128623 78154
According to dmesg, this is the piixpm0 device:
# dmesg
[...]
piixpm0 at pci0 dev 1 function 3: vendor 0x8086 product 0x7113 (rev. 0x03)
timecounter: Timecounter "piixpm0" frequency 3579545 Hz quality 1000
piixpm0: 24-bit timer
piixpm0: interrupting at ioapic0 pin 9
[...]
Versions of qemu lacking commit
d7a51dbbaa70677846453f8c961590913052dd86 do not have this problem.
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