linux-kernel - Re: [PATCH] mm: page_alloc: High-order per-cpu page allocator v7

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Message-ID: <20161208110656.bnkvqg73qnjkehbc@techsingularity.net>
Date:   Thu, 8 Dec 2016 11:06:56 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: page_alloc: High-order per-cpu page allocator v7

On Thu, Dec 08, 2016 at 11:43:08AM +0100, Jesper Dangaard Brouer wrote:
> > That's expected. In the initial sniff-test, I saw negligible packet loss.
> > I'm waiting to see what the full set of network tests look like before
> > doing any further adjustments.
> 
> For netperf I will not recommend adjusting the global default
> /proc/sys/net/core/rmem_default as netperf have means of adjusting this
> value from the application (which were the options you setup too low
> and just removed). I think you should keep this as the default for now
> (unless Eric says something else), as this should cover most users.
> 

Ok, the current state is that buffer sizes are only set for netperf
UDP_STREAM and only when running over a real network. The values selected
were specific to the network I had available so milage may vary.
localhost is left at the defaults.

-- 
Mel Gorman
SUSE Labs