[dpdk-dev] [PATCH v3 5/6] net/mlx4: add control of excessive memory pinning by kernel

Stephen Hemminger stephen at networkplumber.org
Tue May 14 06:54:37 CEST 2019


On Mon, 13 May 2019 21:52:22 -0700
Stephen Hemminger <stephen at networkplumber.org> wrote:

> On Mon,  1 Apr 2019 14:17:56 -0700
> Yongseok Koh <yskoh at mellanox.com> wrote:
> 
> > +- ``mr_ext_memseg_en`` parameter [int]
> > +
> > +  A nonzero value enables extending memseg when registering DMA memory. If
> > +  enabled, the number of entries in MR (Memory Region) lookup table on datapath
> > +  is minimized and it benefits performance. On the other hand, it worsens memory
> > +  utilization because registered memory is pinned by kernel driver. Even if a
> > +  page in the extended chunk is freed, that doesn't become reusable until the
> > +  entire memory is freed.
> > +
> > +  Enabled by default.
> > +  
> 
> This module parameter does not appear in the upstream Linux kernel drivers (even 5.2).
> What code are you referring to?

Nevermind, it is a DPDK not kernel parameter.


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