From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jan Dakinevich <jan.dakinevich@virtuozzo.com>,
Doug Ledford <dledford@redhat.com>,
Yishai Hadas <yishaih@mellanox.com>,
Parav Pandit <parav@mellanox.com>,
Mark Bloch <markb@mellanox.com>,
Daniel Jurgens <danielj@mellanox.com>,
Kees Cook <keescook@chromium.org>,
Kamal Heib <kamalheib1@gmail.com>,
Bart Van Assche <bvanassche@acm.org>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
Denis Lunev <den@virtuozzo.com>,
Konstantin Khorenko <khorenko@virtuozzo.com>
Subject: Re: [PATCH 0/4] IB: decrease large contigous allocation
Date: Wed, 19 Sep 2018 00:23:51 +0300 [thread overview]
Message-ID: <20180918212351.GB3661@mtr-leonro.mtl.com> (raw)
In-Reply-To: <20180918144623.GI11367@ziepe.ca>
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On Tue, Sep 18, 2018 at 08:46:23AM -0600, Jason Gunthorpe wrote:
> On Tue, Sep 18, 2018 at 04:03:42PM +0300, Jan Dakinevich wrote:
> > The size of mlx4_ib_device became too large to be allocated as whole contigous
> > block of memory. Currently it takes about 55K. On architecture with 4K page it
> > means 3rd order.
> >
> > This patch series makes an attempt to split mlx4_ib_device into several parts
> > and allocate them with less expensive kvzalloc
>
> Why split it up? Any reason not to just allocate the whole thing with
> kvzalloc?
And before we are rushing to dissect mlx4_ib driver, can you
explain the rationale behind this change? The mlx4_ib driver
represents high-performance device which needs enough memory
resources to operate. Those devices are limited by number
of PCIs and SRIOV VFs (upto 126) and very rare allocated/deallocated.
I would like to see real rationale behind such change.
Thanks
>
> Jason
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next prev parent reply other threads:[~2018-09-18 21:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 13:03 Jan Dakinevich
2018-09-18 13:03 ` [PATCH 1/4] IB/core: introduce ->release() callback Jan Dakinevich
2018-09-18 14:44 ` Jason Gunthorpe
2018-09-18 13:03 ` [PATCH 2/4] IB/mlx4: move iboe field aside from mlx4_ib_dev Jan Dakinevich
2018-09-18 13:03 ` [PATCH 3/4] IB/mlx4: move pkeys " Jan Dakinevich
2018-09-18 13:03 ` [PATCH 4/4] IB/mlx4: move sriov " Jan Dakinevich
2018-09-18 14:46 ` [PATCH 0/4] IB: decrease large contigous allocation Jason Gunthorpe
2018-09-18 21:23 ` Leon Romanovsky [this message]
2018-09-26 15:43 ` Jan Dakinevich
2018-09-26 17:00 ` Leon Romanovsky
2018-09-26 15:48 ` Jan Dakinevich
2018-09-26 17:06 ` Jason Gunthorpe
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