Date: Fri, 04 Nov 2005 17:17:26 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-emulation@freebsd.org Subject: kqemu speed up Message-ID: <436B7B86.4060602@icyb.net.ua>
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How much does kqemu speed up qemu ?
What is the typical difference in speed between guest running in
qemu+kqemu and host ?
The reason I am asking is the following:
host (FreeBSD 5.4):
$ /usr/bin/time -h dd if=/dev/random of=/dev/null bs=4 count=100k
102400+0 records in
102400+0 records out
409600 bytes transferred in 0.342956 secs (1194322 bytes/sec)
0.34s real 0.03s user 0.25s sys
$ fstat /dev/kqemu0
USER CMD PID FD MOUNT INUM MODE SZ|DV R/W NAME
root qemu 18715 9 /dev 203 crw-rw---- kqemu0 rw
/dev/kqemu0
guest (FreeBSD 6.0):
$ /usr/bin/time -h dd if=/dev/random of=/dev/null bs=4 count=10k
10240+0 records in
10240+0 records out
409600 bytes transferred in 59.620314 secs (6870 bytes/sec)
59.76s real 1.96s user 55.29s sys
As you can see the difference is two orders of magnitude. I think I had
similar figures without kqemu and I thought that with kqemu guest speed
is close to host speed. What gives ?
--
Andriy Gapon
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