mempool with custom alignment

mempool with custom alignment

[Dax Rawal]

Hi,
I use mempool APIs to allocate DMA-able descriptor ring and buffers so that
I get both physical and virtual addresses of allocated memory. I buffers I
get from the mempool APIs are 64 byte aligned. My requirement is 256byte
alignment. How to achieve this? mempool APIs do not seem to take alignment
parameters.

Thanks,
-Dax

Re: mempool with custom alignment

[Cyril Chemparathy]

On Wed, 3 Jun 2015 11:30:17 -0700
Hi Dax,

Dax Rawal <daxayrawal@gmail.com> wrote:

> Hi,
> I use mempool APIs to allocate DMA-able descriptor ring and buffers
> so that I get both physical and virtual addresses of allocated
> memory. I buffers I get from the mempool APIs are 64 byte aligned. My
> requirement is 256byte alignment. How to achieve this? mempool APIs
> do not seem to take alignment parameters.
> 

I have a patch that allows configuration override of mempool element
alignment to allow for larger alignment limits (e.g. 128B on the
TILE-Gx platform, 256B on yours). Would that suffice? If so, I'd be
happy to post this patch on the mailing list.

Thanks
-- Cyril.

Re: mempool with custom alignment

[Dax Rawal]

Hi Cyril,

Definitely, yes.

Thanks.
-Dax


On Wed, Jun 3, 2015 at 11:36 AM, Cyril Chemparathy <cchemparathy@ezchip.com>
wrote:

> On Wed, 3 Jun 2015 11:30:17 -0700
> Hi Dax,
>
> Dax Rawal <daxayrawal@gmail.com> wrote:
>
> > Hi,
> > I use mempool APIs to allocate DMA-able descriptor ring and buffers
> > so that I get both physical and virtual addresses of allocated
> > memory. I buffers I get from the mempool APIs are 64 byte aligned. My
> > requirement is 256byte alignment. How to achieve this? mempool APIs
> > do not seem to take alignment parameters.
> >
>
> I have a patch that allows configuration override of mempool element
> alignment to allow for larger alignment limits (e.g. 128B on the
> TILE-Gx platform, 256B on yours). Would that suffice? If so, I'd be
> happy to post this patch on the mailing list.
>
> Thanks
> -- Cyril.
>

Re: mempool with custom alignment

[Ananyev, Konstantin]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Dax Rawal
> Sent: Wednesday, June 03, 2015 7:30 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] mempool with custom alignment
> 
> Hi,
> I use mempool APIs to allocate DMA-able descriptor ring and buffers so that
> I get both physical and virtual addresses of allocated memory. I buffers I
> get from the mempool APIs are 64 byte aligned. My requirement is 256byte
> alignment. How to achieve this? mempool APIs do not seem to take alignment
> parameters.
> 
> Thanks,
> -Dax

Something like that:
http://patchwork.dpdk.org/ml/archives/dev/2014-October/006595.html
should work, I think.
Konstantin

Re: mempool with custom alignment

[Dax Rawal]

Thanks, Konstantin.

On Thu, Jun 4, 2015 at 1:45 AM, Ananyev, Konstantin <
konstantin.ananyev@intel.com> wrote:

>
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Dax Rawal
> > Sent: Wednesday, June 03, 2015 7:30 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] mempool with custom alignment
> >
> > Hi,
> > I use mempool APIs to allocate DMA-able descriptor ring and buffers so
> that
> > I get both physical and virtual addresses of allocated memory. I buffers
> I
> > get from the mempool APIs are 64 byte aligned. My requirement is 256byte
> > alignment. How to achieve this? mempool APIs do not seem to take
> alignment
> > parameters.
> >
> > Thanks,
> > -Dax
>
> Something like that:
> http://patchwork.dpdk.org/ml/archives/dev/2014-October/006595.html
> should work, I think.
> Konstantin
>