On Thu, 26 Jan 2012, Avi Kivity wrote:
On 01/25/2012 10:15 PM, Gerhard Wiesinger wrote:
On Sun, 15 Jan 2012, Avi Kivity wrote:
On 01/15/2012 04:40 PM, Gerhard Wiesinger wrote:
On Sun, 15 Jan 2012, Jan Kiszka wrote:
On 2012-01-15 15:17, Avi Kivity wrote:
Otherwise, the dirty log information is lost in the kernel forever.
Fixes opensuse-12.1 boot screen, which changes the vga windows
rapidly.
Confirmed, problems solved here.
Problem from:
http://permalink.gmane.org/gmane.comp.emulators.qemu/131853
Confirmed to be fixed, too. Long awaited patch :-)
Sorry, I forgot about that. Please ping me if I do that.
BTW: There is also a major difference in video performance:
1.) With Patch: 1400MB/s (MByte/s)
2.) Without Patch: 6MB/s
Any reason for that?
What are you measuring exactly?
I'm measuring VGA video performance under DOS with own written test
program.
What's strange, new findings: Measurement doesn't depend on the patch.
Sometimes it is high sometimes low. I think I have to investigate
further.
Any ideas?
What vga mode are you using? What does the test program do?
DOS Test programs, source and binaries can be found at:
http://www.wiesinger.com/opensource/qemu/
1.) Measures page A000:0000 with videomode 4F02, see:
http://www.wiesinger.com/opensource/qemu/memperf.c
2.) Second test program measures setting and getting video bank, see:
http://www.wiesinger.com/opensource/qemu/int10per.c
We already talked about the low performance some time ago and tracked it
down to kernel <=> userspace switching. But I benchmarked it already once
and I think there are some optimizations possible (linear list search)
with mapping functions (e.g. trivial hash function before)
Thnx.
Ciao,
Gerhard
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http://www.wiesinger.com/
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