netdev - Re: [PATCH net-next] hv_netvsc: use skb_get_hash() instead of a homegrown implementation

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Date:	Mon, 25 Jan 2016 09:09:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:	netdev@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	David Miller <davem@...emloft.net>,
	Tom Herbert <tom@...bertland.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH net-next] hv_netvsc: use skb_get_hash() instead of a
 homegrown implementation

On Mon, 2016-01-25 at 16:00 +0100, Vitaly Kuznetsov wrote:
> Recent changes to 'struct flow_keys' (e.g commit d34af823ff40 ("net: Add
> VLAN ID to flow_keys")) introduced a performance regression in netvsc
> driver. Is problem is, however, not the above mentioned commit but the
> fact that netvsc_set_hash() function did some assumptions on the struct
> flow_keys data layout and this is wrong.
> 
> Get rid of netvsc_set_hash() by switching to skb_get_hash(). This change
> will also imply switching to Jenkins hash from the currently used Toeplitz
> but it seems there is no good excuse for Toeplitz to stay.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---

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

Thanks !