* [Qemu-devel] raltelimit bug
@ 2012-10-24 8:56 Dietmar Maurer
2012-10-24 9:28 ` Paolo Bonzini
2012-10-24 23:24 ` Eric Blake
0 siblings, 2 replies; 3+ messages in thread
From: Dietmar Maurer @ 2012-10-24 8:56 UTC (permalink / raw)
To: pbonzini@redhat.com, qemu-devel@nongnu.org
The code to compute slice_quota seems buggy. The following fixes the issue:
--- new.orig/include/qemu/ratelimit.h 2012-10-22 07:06:31.000000000 +0200
+++ new/include/qemu/ratelimit.h 2012-10-22 07:06:49.000000000 +0200
@@ -42,7 +42,7 @@
uint64_t slice_ns)
{
limit->slice_ns = slice_ns;
- limit->slice_quota = ((double)speed * 1000000000ULL) / slice_ns;
+ limit->slice_quota = ((double)speed * slice_ns)/1000000000ULL;
}
#endif
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] raltelimit bug
2012-10-24 8:56 [Qemu-devel] raltelimit bug Dietmar Maurer
@ 2012-10-24 9:28 ` Paolo Bonzini
2012-10-24 23:24 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Paolo Bonzini @ 2012-10-24 9:28 UTC (permalink / raw)
To: Dietmar Maurer; +Cc: qemu-devel@nongnu.org
Il 24/10/2012 10:56, Dietmar Maurer ha scritto:
> The code to compute slice_quota seems buggy. The following fixes the issue:
>
> --- new.orig/include/qemu/ratelimit.h 2012-10-22 07:06:31.000000000 +0200
> +++ new/include/qemu/ratelimit.h 2012-10-22 07:06:49.000000000 +0200
> @@ -42,7 +42,7 @@
> uint64_t slice_ns)
> {
> limit->slice_ns = slice_ns;
> - limit->slice_quota = ((double)speed * 1000000000ULL) / slice_ns;
> + limit->slice_quota = ((double)speed * slice_ns)/1000000000ULL;
> }
>
> #endif
Ouch, you're right.
The patch that introduced include/qemu/ratelimit.h did:
- limit->slice_quota = speed / (1000000000ULL / SLICE_TIME);
+ limit->slice_quota = ((double)speed * 1000000000ULL) / slice_ns;
Can you submit the patch with a commit message and Signed-off-by line?
Paolo
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] raltelimit bug
2012-10-24 8:56 [Qemu-devel] raltelimit bug Dietmar Maurer
2012-10-24 9:28 ` Paolo Bonzini
@ 2012-10-24 23:24 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Eric Blake @ 2012-10-24 23:24 UTC (permalink / raw)
To: Dietmar Maurer; +Cc: pbonzini@redhat.com, qemu-devel@nongnu.org
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On 10/24/2012 02:56 AM, Dietmar Maurer wrote:
> The code to compute slice_quota seems buggy. The following fixes the issue:
>
> --- new.orig/include/qemu/ratelimit.h 2012-10-22 07:06:31.000000000 +0200
Missing a Signed-off-By, so it cannot be taken as-is. See
http://wiki.qemu.org/Contribute/SubmitAPatch for hints.
> +++ new/include/qemu/ratelimit.h 2012-10-22 07:06:49.000000000 +0200
> @@ -42,7 +42,7 @@
> uint64_t slice_ns)
> {
> limit->slice_ns = slice_ns;
> - limit->slice_quota = ((double)speed * 1000000000ULL) / slice_ns;
> + limit->slice_quota = ((double)speed * slice_ns)/1000000000ULL;
> }
>
> #endif
>
>
>
>
--
Eric Blake eblake@redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-10-24 8:56 [Qemu-devel] raltelimit bug Dietmar Maurer
2012-10-24 9:28 ` Paolo Bonzini
2012-10-24 23:24 ` Eric Blake
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