On Oct 22, 2014, at 12:53 AM, Jakub Libosvar <libos...@redhat.com> wrote:
> On 10/22/2014 02:26 AM, Maru Newby wrote: >> We merged caching support for the metadata agent in juno, and backported to >> icehouse. It was enabled by default in juno, but disabled by default in >> icehouse to satisfy the stable maint requirement of not changing functional >> behavior. >> >> While performance of the agent was improved with caching enabled, it >> regressed a reported 8x when caching was disabled [1]. This means that by >> default, the caching backport severely impacts icehouse Neutron's >> performance. >> >> So, what is the way forward? We definitely need to document the problem for >> both icehouse and juno. Is documentation enough? Or can we enable caching >> by default in icehouse? Or remove the backport entirely. >> >> There is also a proposal to replace the metadata agent’s use of the neutron >> client in favor of rpc [2]. There were comments on an old bug suggesting we >> didn’t want to do this [3], but assuming that we want this change in Kilo, >> is backporting even a possibility given that it implies a behavioral change >> to be useful? >> >> Thanks, >> >> >> Maru >> >> >> >> 1: https://bugs.launchpad.net/cloud-archive/+bug/1361357 >> 2: https://review.openstack.org/#/c/121782 >> 3: https://bugs.launchpad.net/neutron/+bug/1092043 >> _______________________________________________ >> OpenStack-dev mailing list >> OpenStack-dev@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >> > I thought the performance regression was caused by wrong keystone token > caching leading to authentication per neutron client instance. Fix was > backported to Icehouse [1]. > > Does it mean this patch hasn't solved the problem and regression is > somewhere else? As you say (and as per Ihar and Akihiro’s responses), the problem was fixed. I was confused by the bug that Oleg’s RPC proposal hard targeted as a related bug and thought the problem wasn’t yet resolved, but looking at it again it appears the bug is a Ubuntu distro issue. Accordingly, I’ve removed Neutron as a target for that bug. Apologies for the confusion. Maru > Kuba > > [1] https://review.openstack.org/#/c/120418/ > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
