From: Avi Kivity <avi@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>,
Sasha Levin <levinsasha928@gmail.com>,
Pekka Enberg <penberg@kernel.org>,
kvm@vger.kernel.org, asias.hejun@gmail.com, gorcunov@gmail.com,
prasadjoshi124@gmail.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
takuya.yoshikawa@gmail.com
Subject: Re: [PATCH v2 6/8] kvm tools: Add rwlock wrapper
Date: Mon, 30 May 2011 15:44:09 +0300 [thread overview]
Message-ID: <4DE39119.6050302@redhat.com> (raw)
In-Reply-To: <20110530123602.GK22324@elte.hu>
On 05/30/2011 03:36 PM, Ingo Molnar wrote:
> You are probably right about 1024 CPUs.
>
> Right now i can produce something similar to it: 42 vcpus on a single
> CPU:
>
> $ taskse 1 kvm run --cpus 42
>
> And that hangs early on during bootup, around:
>
> [ 0.236000] Disabled fast string operations
> [ 0.242000] #4
> [ 0.270000] Disabled fast string operations
> [ 0.275000] #5
> [ 0.317000] Disabled fast string operations
> [ 0.322000] #6
> [ 0.352000] Disabled fast string operations
> [ 0.358000] #7
> [ 0.414000] Disabled fast string operations
>
> The threads seem to be livelocked:
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 22227 mingo 20 0 471g 95m 904 R 12.9 0.8 0:06.39 kvm
> 22230 mingo 20 0 471g 95m 904 R 12.9 0.8 0:06.36 kvm
> 22226 mingo 20 0 471g 95m 904 R 11.9 0.8 0:07.04 kvm
> 22228 mingo 20 0 471g 95m 904 R 11.9 0.8 0:06.38 kvm
> 22229 mingo 20 0 471g 95m 904 R 11.9 0.8 0:06.37 kvm
> 22231 mingo 20 0 471g 95m 904 R 11.9 0.8 0:06.37 kvm
> 22232 mingo 20 0 471g 95m 904 R 11.9 0.8 0:06.36 kvm
> 22233 mingo 20 0 471g 95m 904 R 11.9 0.8 0:06.33 kvm
> 7 root -2 19 0 0 0 S 2.0 0.0 1:12.53 rcuc0
>
> with no apparent progress being made.
>
Well, strangely, 42-on-1 booted for me in qemu, and only got
ridiculously slow in initrd. Three minutes and it's still booting.
I don't really see how tools/kvm could cause this slowness, though.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-05-30 12:44 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 8:30 [PATCH v2 1/8] kvm tools: Use correct value for user signal base Sasha Levin
2011-05-30 8:30 ` [PATCH v2 2/8] kvm tools: Remove wrong global definition of kvm Sasha Levin
2011-05-30 8:38 ` Ingo Molnar
2011-05-30 8:59 ` Sasha Levin
2011-05-30 8:30 ` [PATCH v2 3/8] kvm tools: Allow pausing guests Sasha Levin
2011-05-30 8:39 ` Ingo Molnar
2011-05-30 8:30 ` [PATCH v2 4/8] kvm tools: Pause/resume guest using SIGUSR2 Sasha Levin
2011-05-30 8:41 ` Ingo Molnar
2011-05-30 8:30 ` [PATCH v2 5/8] kvm tools: Add a brlock Sasha Levin
2011-05-30 8:30 ` [PATCH v2 6/8] kvm tools: Add rwlock wrapper Sasha Levin
2011-05-30 8:43 ` Ingo Molnar
2011-05-30 9:29 ` Pekka Enberg
2011-05-30 9:34 ` Sasha Levin
2011-05-30 9:40 ` Pekka Enberg
2011-05-30 9:46 ` Sasha Levin
2011-05-30 9:48 ` Pekka Enberg
2011-05-30 9:54 ` Ingo Molnar
2011-05-30 11:11 ` Takuya Yoshikawa
2011-05-30 11:12 ` Sasha Levin
2011-05-30 11:26 ` Takuya Yoshikawa
2011-05-30 11:39 ` Avi Kivity
2011-05-30 11:49 ` Ingo Molnar
2011-05-30 11:55 ` Pekka Enberg
2011-05-30 11:58 ` Sasha Levin
2011-05-30 12:20 ` Ingo Molnar
2011-05-30 12:22 ` Sasha Levin
2011-05-30 12:25 ` Avi Kivity
2011-05-30 12:23 ` Avi Kivity
2011-05-30 12:30 ` Pekka Enberg
2011-05-30 12:32 ` Avi Kivity
2011-05-30 14:10 ` Ingo Molnar
2011-05-30 14:30 ` Avi Kivity
2011-05-30 14:43 ` Ingo Molnar
2011-05-30 14:50 ` Avi Kivity
2011-05-30 19:32 ` Ingo Molnar
2011-05-30 12:04 ` Avi Kivity
2011-05-30 12:36 ` Ingo Molnar
2011-05-30 12:44 ` Avi Kivity [this message]
2011-05-30 12:46 ` Pekka Enberg
2011-05-30 12:48 ` Avi Kivity
2011-05-30 13:05 ` Sasha Levin
2011-06-03 7:27 ` Sasha Levin
2011-06-03 7:34 ` Ingo Molnar
2011-06-03 7:54 ` Sasha Levin
2011-06-03 19:31 ` Paul E. McKenney
2011-06-03 19:56 ` Sasha Levin
2011-06-03 20:22 ` Paul E. McKenney
2011-06-03 21:03 ` Sasha Levin
2011-06-03 21:20 ` Paul E. McKenney
2011-06-03 22:54 ` Sasha Levin
2011-06-03 23:05 ` Paul E. McKenney
2011-06-04 6:26 ` Sasha Levin
2011-06-04 16:30 ` Paul E. McKenney
2011-06-14 22:26 ` Sasha Levin
2011-06-14 23:42 ` Paul E. McKenney
2011-06-15 1:25 ` Sasha Levin
2011-06-15 4:22 ` Paul E. McKenney
2011-06-05 12:12 ` Avi Kivity
2011-05-30 14:16 ` Takuya Yoshikawa
2011-05-30 9:56 ` Ingo Molnar
2011-05-30 10:05 ` Sasha Levin
2011-05-30 10:13 ` Ingo Molnar
2011-05-30 10:22 ` Sasha Levin
2011-05-30 10:30 ` Ingo Molnar
2011-05-30 10:41 ` Sasha Levin
2011-05-30 8:30 ` [PATCH v2 7/8] kvm tools: Add debug mode to brlock Sasha Levin
2011-05-30 8:30 ` [PATCH v2 8/8] kvm tools: Use brlock in MMIO and IOPORT Sasha Levin
2011-05-30 8:47 ` Ingo Molnar
2011-05-30 8:56 ` Sasha Levin
2011-05-30 8:35 ` [PATCH v2 1/8] kvm tools: Use correct value for user signal base Ingo Molnar
2011-05-30 8:40 ` Sasha Levin
2011-05-30 8:49 ` Ingo Molnar
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