From: Michael S. Tsirkin <mst@redhat.com>
Date: Thu, 6 Dec 2012 15:00:18 +0000 (+0200)
Subject: vhost-net: skip head management if no outstanding
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~45^2~58^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cedb9bdce099206290a2bdd02ce47a7b253b6a84;p=pandora-kernel.git

vhost-net: skip head management if no outstanding

For short packets zerocopy mode adds overhead
of managing heads which isn't necessary: we
could simly update used ring directly
same as with zerocopy disabled.

Things seem to run a bit faster if we detect
and bypass head management when zcopy isn't used.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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