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Date: Mon, 23 Jul 2007 09:48:56 -0500 (CDT)
From: "Sean C. Farley" <scf@FreeBSD.org>
To: Eric Anderson <anderson@FreeBSD.org>
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Cc: attilio@FreeBSD.org, freebsd-current@FreeBSD.org,
	Harald Schmalzbauer <h.schmalzbauer@omnisec.de>
Subject: Re: kqemu crash (page fault) with -current
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On Fri, 13 Jul 2007, Eric Anderson wrote:

> On 07/13/07 17:29, Sean C. Farley wrote:
>> On Fri, 13 Jul 2007, Harald Schmalzbauer wrote:
>> 
>>> I could install various OS, only when I enable -kernel-kqemu most
>>> installer quit with page fault.
>> 
>> As a side note, I found -kernel-kqemu to be slower for me than
>> without it on STABLE.
>
> Using ubench from ports on -CURRENT, I see these kinds of numbers (for
> CPU):
>
> Without any kqemu:       16000 ->  16800
> With kqemu, kernelmode: 180000 -> 182000
> With kqemu, usermode:   187000 -> 188000
> RAW CPU:                202000 -> 203000

Here is mine on -STABLE.  It is amusing how much faster the raw CPU
really is when you take these benchmark numbers into account.  If I
remember correctly from trying to find where QEMU was slow, kqemu user +
kernel actually has significantly more context switches than just kqemu
user.

kqemu user
==========
Ubench CPU:    74871
Ubench MEM:     8873
--------------------
Ubench AVG:    41872


kqemu user + kernel
===================
Ubench CPU:    67768
Ubench MEM:     6520
--------------------
Ubench AVG:    37144


Raw
===
Ubench CPU:    44162
Ubench MEM:    42655
--------------------
Ubench AVG:    43408

Sean
-- 
scf@FreeBSD.org