On Tue, May 26, 2020 at 01:51:54PM -0700, Han Zhou wrote: > On Tue, May 26, 2020 at 1:18 PM Ben Pfaff <b...@ovn.org> wrote: > > > > Hi Han! > > > > I'm working on the port of ovn-northd to DDlog. It works, and now we're > > working on optimizations. One of the areas where the DDlog > > implementation has performance limitations is around ID allocation for > > datapaths and ports, so Leonid is working on a new allocator. > > > > OVN supports static assignments for datapath and port IDs, which I > > believe is for the use of interconnection. The new allocator is going > > to work out better if statically assigned IDs are limited to some range > > that the allocator does not use for dynamic assignments. For example, > > the static assignments could be the top half (or top N, or whatever) of > > the range. Is that something that would be OK for the interconnection > > feature? If so, we can make OVN allocation much more efficient; if not, > > we'll have to think a lot harder. > > > > Thanks, > > > > Ben. > > Hi Ben, > > It is ok to have specific range for statically assigned IDs. In fact for > DP, it is already using separated range between local and global (i.e. > interconnection). > > See lib/ovn-util.h: > #define OVN_MAX_DP_KEY ((1u << 24) - 1) > #define OVN_MAX_DP_GLOBAL_NUM ((1u << 16) - 1) > #define OVN_MIN_DP_KEY_LOCAL 1 > #define OVN_MAX_DP_KEY_LOCAL (OVN_MAX_DP_KEY - OVN_MAX_DP_GLOBAL_NUM) > #define OVN_MIN_DP_KEY_GLOBAL (OVN_MAX_DP_KEY_LOCAL + 1) > #define OVN_MAX_DP_KEY_GLOBAL OVN_MAX_DP_KEY > > For lports, since all interconnection ports are on the global DPs, there is > no chance of ID conflict between local and global, so such separation > wasn't necessary. However, I don't see any problem if we do that for > performance reasons in DDlog, as long as the ID space is enough for both > part. I think the global ports are not so many. Say we have 50 AZs, each > with 40 interconnection ports, which would be a super large scale, then a > range with (1u << 11 == 2048) would be more than enough.
That is good news. Thank you! _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
