Re: [dpdk-dev] [PATCH v2] mempool: fix alignment of memzone length when populating

[Thomas Monjalon <thomas@monjalon.net>]

07/05/2018 10:30, Andrew Rybchenko:
> On 05/07/2018 11:18 AM, Olivier Matz wrote:
> > When populating a mempool with the default function, if there is not
> > enough virtually contiguous memory for the whole mempool, it will be
> > populated with several chunks. A chunk of the maximum available length
> > is requested with:
> >
> >    mz = rte_memzone_reserve_aligned(..., len=0, ..., align=x)
> >
> > If align is smaller than the page size, the address and the length of
> > the memzone may not be a multiple of the page size. This makes
> > rte_mempool_populate_virt() to fail because it requires them to be
> > page-aligned. This patch fixes that.
> >
> > The problem can be reproduced easily by allocating more than available
> > memory:
> >    ./build/app/testpmd -l 0,1 -- --total-num-mbufs=65536
> >    ...
> >    Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> >
> > After the patch, the error code is correct:
> >    ./build/app/testpmd -l 0,1 -- --total-num-mbufs=65536
> >    ...
> >    Cause: Creation of mbuf pool for socket 0 failed: Cannot allocate memory
> >
> > Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
> > Fixes: ba0009560c30 ("mempool: support new allocation methods")
> > Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
> Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>

Applied, thanks