From: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
To: qemu-devel@nongnu.org
Cc: jan.kiszka@siemens.com
Subject: [Qemu-devel] TCG slowdown
Date: Sat, 20 Aug 2011 22:51:22 +0200 [thread overview]
Message-ID: <20110820205122.GA29545@zapo> (raw)
Lately, my TCG emulated machines have been running terribly slow.
Like a factor 3 or 4 slower, hardly usable.
I bisected it to this:
commit d5ab9713d2d4037fd56b0adddd26c8d4dc11cf09
Author: Jan Kiszka <jan.kiszka@siemens.com>
Date: Tue Aug 2 16:10:21 2011 +0200
Avoid allocating TCG resources in non-TCG mode
Do not allocate TCG-only resources like the translation buffer when
running over KVM or XEN. Saves a "few" bytes in the qemu address space
and is also conceptually cleaner.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
It turns out that the init of the tb cache is now moved to before ram_size
gets it's default value. And because the default tb cache size, if no
-tb-size option is given, is based on the ram_size it is now zero..
Cheers
next reply other threads:[~2011-08-20 20:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-20 20:51 Edgar E. Iglesias [this message]
2011-08-20 22:37 ` [Qemu-devel] TCG slowdown Jan Kiszka
2011-08-20 23:05 ` Edgar E. Iglesias
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