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[Qemu-devel] 4 CPUs with vexpress is slow?
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From: |
Frederic Konrad |
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Subject: |
[Qemu-devel] 4 CPUs with vexpress is slow? |
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Date: |
Mon, 22 Jun 2015 20:18:36 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
Hi,
Testing MTTCG patch-set performance I found strange slowness with _upstream_
qemu (46bca5404b08201bb9df1ac32bc88fc7e6db1f74).
Basically booting a vexpress-a15 with "-smp 4" takes approximately
forever if I use a
vexpress-v2p-ca15-tc1.dtb (2x A15) dtb and 39 secs if I hack this dtb to
have 4 CPUs.
This is definitely strange because if I use "-smp 2" with the same guest
image it takes
only 4 secs. And MTTCG patch-set seems to fix the issue as it boot in 6
secs with
"-smp 4".
Is that a known issue or maybe it's my guest (linux 3.13.5)?
Fred
- [Qemu-devel] 4 CPUs with vexpress is slow?,
Frederic Konrad <=