From: Aurelien Jarno <aurel32@debian.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1091241] Re: NetBSD/i386 6.0 guest suffers interrupt storm since qemu BIOS update
Date: Mon, 20 May 2013 17:33:22 -0000 [thread overview]
Message-ID: <20130520173323.7052.20320.launchpad@wampee.canonical.com> (raw)
In-Reply-To: 20121217141546.24058.16747.malonedeb@soybean.canonical.com
** Changed in: qemu
Status: Fix Committed => Fix Released
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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:
Fix Released
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.
To manage notifications about this bug go to:
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prev parent reply other threads:[~2013-05-20 17:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-17 14:15 [Qemu-devel] [Bug 1091241] [NEW] NetBSD/i386 6.0 guest suffers interrupt storm since qemu BIOS update Andreas Gustafsson
2013-01-05 20:28 ` [Qemu-devel] [Bug 1091241] " Andreas Gustafsson
2013-05-20 17:33 ` Aurelien Jarno [this message]
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