From: Roland Dreier <rdreier@cisco.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ben Collins <ben.collins@ubuntu.com>,
linux-kernel@vger.kernel.org, Zachary Amsden <zach@vmware.com>
Subject: Re: [PATCH 4/6] RTC: Ratelimit "lost interrupts" message
Date: Thu, 24 May 2007 14:15:12 -0700 [thread overview]
Message-ID: <adaejl56hzz.fsf@cisco.com> (raw)
In-Reply-To: <20070524140956.12ff7c99.akpm@linux-foundation.org> (Andrew Morton's message of "Thu, 24 May 2007 14:09:56 -0700")
> > I got it a lot when using any sort of virtualization on my Core2Duo
> > (kvm, vmware, qemu). Just a big spew. Honestly, I was getting this with
> > 2.6.20, and haven't tested again with latest kernel.
>
> OK, a bit of googling finds things like this:
> http://chxo.com/be2/20060821_3333.html, so I assume that it's some sort of
> generic problem with the hypervisor's emulation of the RTC.
Actually I saw this "lost interrupts" spew on the host (ie the
non-virtualized kernel) running just plain qemu (no kvm or anything
scary like that). It seemed to be some long irqs-off latency in the
tun/tap or bridging code (it went away when I stopped using "-net tap"
on the qemu command line), but I never succeeded in getting Ingo's
latency tracer to be able to track it down.
- R.
next prev parent reply other threads:[~2007-05-24 21:15 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-23 21:59 [PATCH 0/6] Patch sync from Ubuntu tree Ben Collins
2007-05-23 21:59 ` [PATCH 1/6] i386/x86_64: Allow disabling the putstr's from compressed boot wrapper Ben Collins
2007-05-24 3:15 ` Randy Dunlap
2007-05-24 20:44 ` [PATCH 1/6] i386/x86_64: Allow disabling the putstr's from compressed boot wrapper (fixed) Andrew Morton
2007-05-25 11:33 ` [PATCH 1/6] i386/x86_64: Allow disabling the putstr's from compressed boot wrapper Andi Kleen
2007-05-25 12:52 ` Ben Collins
2007-05-25 19:45 ` H. Peter Anvin
2007-05-25 23:23 ` Jesse Barnes
2007-05-25 23:28 ` H. Peter Anvin
2007-05-25 23:38 ` Jesse Barnes
2007-05-25 23:43 ` H. Peter Anvin
2007-05-25 23:50 ` Jesse Barnes
2007-05-25 23:50 ` Ben Collins
2007-05-25 23:52 ` H. Peter Anvin
2007-05-23 22:18 ` [PATCH 2/6] PM: Do not require dev spew to get PM_DEBUG Ben Collins
2007-05-23 22:21 ` [PATCH 3/6] HCIUSB: Initialize the Broadcom USB Bluetooth device in Dell laptops Ben Collins
2007-05-24 17:02 ` Marcel Holtmann
2007-05-24 17:33 ` Ben Collins
2007-05-23 22:23 ` [PATCH 4/6] RTC: Ratelimit "lost interrupts" message Ben Collins
2007-05-24 20:48 ` Andrew Morton
2007-05-24 20:56 ` Ben Collins
2007-05-24 21:09 ` Andrew Morton
2007-05-24 21:15 ` Roland Dreier [this message]
2007-05-24 21:16 ` Zachary Amsden
2007-05-23 22:30 ` [PATCH 5/6] SUNHME: Workaround ancient hang on U1's Ben Collins
2007-05-24 0:17 ` David Miller
2007-05-24 1:59 ` Ben Collins
2007-05-24 12:30 ` Daniel Drake
2007-05-23 22:39 ` [PATCH 6/6] UNUSUAL_DEV: Sync up some reported devices from Ubuntu Ben Collins
2007-05-24 3:59 ` Phil Dibowitz
2007-05-24 4:09 ` Ben Collins
2007-05-30 21:50 ` Dave Jones
2007-05-30 22:25 ` Phil Dibowitz
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