[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [RFC PATCHv1 net-next] xen-netback: always fully coalesce guest Rx packets

On Tue, 2015-01-13 at 14:05 +0000, David Vrabel wrote:
> Always fully coalesce guest Rx packets into the minimum number of ring
> slots.  Reducing the number of slots per packet has significant
> performance benefits (e.g., 7.2 Gbit/s to 11 Gbit/s in an off-host
> receive test).
> However, this does increase the number of grant ops per packet which
> decreases performance with some workloads (intrahost VM to VM)
> /unless/ grant copy has been optimized for adjacent ops with the same
> source or destination (see "grant-table: defer releasing pages
> acquired in a grant copy"[1]).
> Do we need to retain the existing path and make the always coalesce
> path conditional on a suitable version of Xen?
> [1] http://lists.xen.org/archives/html/xen-devel/2015-01/msg01118.html
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Looks good to me, thanks. Based on that plus the conversation in the
other subthread:

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.