netdev - Re: [RFC V3] net: don't wait for order-3 page allocation

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Message-ID: <1434067342.27504.73.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 11 Jun 2015 17:02:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shaohua Li <shli@...com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, Kernel-team@...com,
	clm@...com, linux-mm@...ck.org, dbavatar@...il.com,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [RFC V3] net: don't wait for order-3 page allocation

On Thu, 2015-06-11 at 16:50 -0700, Shaohua Li wrote:
> We saw excessive direct memory compaction triggered by skb_page_frag_refill.
> This causes performance issues and add latency. Commit 5640f7685831e0
> introduces the order-3 allocation. According to the changelog, the order-3
> allocation isn't a must-have but to improve performance. But direct memory
> compaction has high overhead. The benefit of order-3 allocation can't
> compensate the overhead of direct memory compaction.

> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Chris Mason <clm@...com>
> Cc: Debabrata Banerjee <dbavatar@...il.com>
> Signed-off-by: Shaohua Li <shli@...com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>

Thanks.


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