[ovs-dev] [PATCH 7/7] meta-flow: Add mf_mask_subfield_wc()

Jarno Rajahalme jrajahalme at nicira.com
Thu Feb 13 19:13:25 UTC 2014

I tested again with some different parameters, and this actually made the performance little worse, so I’m holding off on this patch for now.


On Feb 11, 2014, at 5:43 PM, Ben Pfaff <blp at nicira.com> wrote:

> On Tue, Feb 11, 2014 at 04:30:49PM -0800, Jarno Rajahalme wrote:
>> The code setting wc masks shows up in 'perf' reports.  This patch streamlines
>> the code and avoids setting the mask bits for registers or metadata, as
>> those fields do not exist on datapaths.
>> Signed-off-by: Jarno Rajahalme <jrajahalme at nicira.com>
> In mf_mask_subfield_wc(), for MFF_IN_PORT and MFF_IN_PORT_OXM, I would
> set the whole field unconditionally to all-1-bits.  (We don't allow
> bitwise matching on input ports and I hope we never do.)  Same for
> MFF_ETH_TYPE, although bitwise matching there is a little less crazy.
> There's an extra space on this line:
>        bitwise_one (&value, field->n_bytes, sf->ofs, sf->n_bits);
> Acked-by: Ben Pfaff <blp at nicira.com>

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