On 05/23/2010 07:30 PM, Michael S. Tsirkin wrote:
>
>
>>> Maybe we should use atomics on index then?
>>>
>>>
>> This should only be helpful if you access the cacheline several times in
>> a row. That's not the case in virtio (or here).
>>
> So why does it help?
>
We actually
On Sun, May 23, 2010 at 07:03:10PM +0300, Avi Kivity wrote:
> On 05/23/2010 06:51 PM, Michael S. Tsirkin wrote:
>>>
So locked version seems to be faster than unlocked,
and share/unshare not to matter?
>>> May be due to the processor using the LOCK operation as a hint to
On Sun, May 23, 2010 at 07:03:10PM +0300, Avi Kivity wrote:
> On 05/23/2010 06:51 PM, Michael S. Tsirkin wrote:
>>>
So locked version seems to be faster than unlocked,
and share/unshare not to matter?
>>> May be due to the processor using the LOCK operation as a hint to
On 05/23/2010 06:51 PM, Michael S. Tsirkin wrote:
>>
>>> So locked version seems to be faster than unlocked,
>>> and share/unshare not to matter?
>>>
>>>
>> May be due to the processor using the LOCK operation as a hint to
>> reserve the cacheline for a bit.
>>
> Maybe we should use a
On Thu, May 20, 2010 at 02:38:16PM +0930, Rusty Russell wrote:
> On Thu, 20 May 2010 02:31:50 pm Rusty Russell wrote:
> > On Wed, 19 May 2010 05:36:42 pm Avi Kivity wrote:
> > > > Note that this is a exclusive->shared->exclusive bounce only, too.
> > > >
> > >
> > > A bounce is a bounce.
> >
On Sun, May 23, 2010 at 06:41:33PM +0300, Avi Kivity wrote:
> On 05/23/2010 06:31 PM, Michael S. Tsirkin wrote:
>> On Thu, May 20, 2010 at 02:38:16PM +0930, Rusty Russell wrote:
>>
>>> On Thu, 20 May 2010 02:31:50 pm Rusty Russell wrote:
>>>
On Wed, 19 May 2010 05:36:42 pm Avi Kivity
On 05/23/2010 06:31 PM, Michael S. Tsirkin wrote:
> On Thu, May 20, 2010 at 02:38:16PM +0930, Rusty Russell wrote:
>
>> On Thu, 20 May 2010 02:31:50 pm Rusty Russell wrote:
>>
>>> On Wed, 19 May 2010 05:36:42 pm Avi Kivity wrote:
>>>
> Note that this is a exclusive->shared->ex
On Thu, May 20, 2010 at 02:38:16PM +0930, Rusty Russell wrote:
> On Thu, 20 May 2010 02:31:50 pm Rusty Russell wrote:
> > On Wed, 19 May 2010 05:36:42 pm Avi Kivity wrote:
> > > > Note that this is a exclusive->shared->exclusive bounce only, too.
> > > >
> > >
> > > A bounce is a bounce.
> >
