On Fri, Jul 15, 2016 at 10:34:40AM +, Ananyev, Konstantin wrote:
> Hi Jerin,
>
> > >
> > >
> > > > The CPU also
> > > > knows already the value that will be written to cons.tail and that
> > > > value does not depend on the previous read either. The CPU does not
> > > > know we are planning t
On Thu, Jul 14, 2016 at 12:56:11PM +, Ananyev, Konstantin wrote:
>
>
> > The CPU also
> > knows already the value that will be written to cons.tail and that value
> > does not depend on the previous read either. The CPU does not
> > know we are planning to do a spinlock there, so it might do
Hi Jerin,
> >
> >
> > > The CPU also
> > > knows already the value that will be written to cons.tail and that
> > > value does not depend on the previous read either. The CPU does not know
> > > we are planning to do a spinlock there, so it might do things
> out-of-order without proper dependenci
Hi Konstantin,
> Hi Juhamatti,
>
> >
> > Hi Konstantin,
> >
> > > > > > > It is quite safe to move the barrier before DEQUEUE because
> > > > > > > after the DEQUEUE there is nothing really that we would want
> > > > > > > to protect
> > > with a
> > > > > read barrier.
> > > > > >
> > > > > > I
Hi Juhamatti,
>
> Hi Konstantin,
>
> > > > > > It is quite safe to move the barrier before DEQUEUE because
> > > > > > after the DEQUEUE there is nothing really that we would want
> > > > > > to protect
> > with a
> > > > read barrier.
> > > > >
> > > > > I don't think so.
> > > > > If you remo
Hi Konstantin,
> > > > > It is quite safe to move the barrier before DEQUEUE because after
> > > > > the DEQUEUE there is nothing really that we would want to protect
> with a
> > > read barrier.
> > > >
> > > > I don't think so.
> > > > If you remove barrier after DEQUEUE(), that means on system
pdk.org] On Behalf Of
> > > > > > > > Juhamatti Kuusisaari
> > > > > > > > Sent: Monday, July 11, 2016 11:21 AM
> > > > > > > > To: dev at dpdk.org
> > > > > > > > Subject: [dpdk-dev] [PATCH] lib: move rte_ring
amatti Kuusisaari
> > > > > > > Sent: Monday, July 11, 2016 11:21 AM
> > > > > > > To: dev at dpdk.org
> > > > > > > Subject: [dpdk-dev] [PATCH] lib: move rte_ring read barrier
> > > > > > > to correct location
> > >
t; Sent: Monday, July 11, 2016 11:21 AM
> > > > > > To: dev at dpdk.org
> > > > > > Subject: [dpdk-dev] [PATCH] lib: move rte_ring read barrier to
> > > > > > correct location
> > > > > >
> > > > > > Fix the
Hi Juhamatti,
>
> Hello,
>
> > > > > -Original Message-
> > > > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti
> > > > > Kuusisaari
> > > > > Sent: Monday, July 11, 2016 11:21 AM
> > > &g
Hello,
> > > > -Original Message-
> > > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti
> > > > Kuusisaari
> > > > Sent: Monday, July 11, 2016 11:21 AM
> > > > To: dev at dpdk.org
> > > > Subjec
Hello,
> >>> -Original Message-
> >>> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti
> >>> Kuusisaari
> >>> Sent: Monday, July 11, 2016 11:21 AM
> >>> To: dev at dpdk.org
> >>> Subject: [dpd
at dpdk.org
>>> Subject: [dpdk-dev] [PATCH] lib: move rte_ring read barrier to correct
>>> location
>>>
>>> Fix the location of the rte_ring data dependency read barrier.
>>> It needs to be called before accessing indexed data to ensure that the
>>>
Fix the location of the rte_ring data dependency read barrier.
It needs to be called before accessing indexed data to ensure
that the data itself is guaranteed to be correctly updated.
See more details at kernel/Documentation/memory-barriers.txt
section 'Data dependency barriers'.
Signed-off-by:
> Hi,
>
> > > -Original Message-
> > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti
> > > Kuusisaari
> > > Sent: Monday, July 11, 2016 11:21 AM
> > > To: dev at dpdk.org
> > > Subject: [dpdk-dev] [PATC
Hi,
> > -Original Message-
> > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti
> > Kuusisaari
> > Sent: Monday, July 11, 2016 11:21 AM
> > To: dev at dpdk.org
> > Subject: [dpdk-dev] [PATCH] lib: move rte_ring read barrier to
Hi ,
> -Original Message-
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Juhamatti Kuusisaari
> Sent: Monday, July 11, 2016 11:21 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [PATCH] lib: move rte_ring read barrier to correct
> location
>
> Fix the
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