From: Eli Cohen <eli-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
To: Rui Machado <ruimario-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: mlx4 kernel parameters
Date: Wed, 3 Feb 2010 16:54:29 +0200 [thread overview]
Message-ID: <20100203145429.GD30979@mtls03> (raw)
In-Reply-To: <6978b4af1002030617v4b55787ei4e66f72de662528a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, Feb 03, 2010 at 03:17:17PM +0100, Rui Machado wrote:
>
> Great, thanks. I increased the log_mtts_per_seg to 5 and was able to
> register more memory. But one question remaining: what is then the
> maximum memory that one is able to register? 5 is the maximum value to
> this parameter, so what does it mean?
>
The overall size of memory that can be registered, from the HCA's
perspective, depends on the number of MTT segments, the number of
MTTs in each segment and PAGE_SIZE. The number of MTT segments however
is limited by the MTT allocator's ability to allocate memory for
managing allocations. Roughly, this is 128K * 8 MTT segments.
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prev parent reply other threads:[~2010-02-03 14:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-03 10:02 mlx4 kernel parameters Rui Machado
[not found] ` <6978b4af1002030202h431384c4ub6de0313e51c4500-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-03 12:42 ` Eli Cohen
2010-02-03 14:17 ` Rui Machado
[not found] ` <6978b4af1002030617v4b55787ei4e66f72de662528a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-03 14:54 ` Eli Cohen [this message]
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