No, and it may not make that much difference. But I'd rather not have someone else asking why we didn't do this on the front end. Keeping all the processing inside one core 1 hop from the IO means I've done what I can to mitigiate any unpredictable behaviors when there isn't PCI and CORE affinity.
Ben On Thu, May 19, 2011 at 7:21 PM, Tony Scully <[email protected]> wrote: > > Hi, > Any idea how much difference this will make? I guesss it depends on how busy > the server is, but I'm wondering if it's worth trying to 'spread' the guest > ldoms on a server across the cpus in the best way possible. Any thoughts? > Tony > > Forwarded conversation > Subject: [ldoms-discuss] IO Domains and CPU socket affinity > ------------------------ > > From: Ben Taylor <[email protected]> > Date: Tue, May 17, 2011 at 3:14 PM > To: [email protected] > > > I am standing up an IO Domain LDOM on a T5440. I remember seeing some > things in the documentation about Socket affinity and PCI buses. I am using > PCI_2 and 64 threads (1 socket), but am just wondering if there's something > I should be doing to better align the threads with the PCI bus, or am I > chasing > a rube goldberg? > > Ben > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > > ---------- > From: Hung-ShengTsao (Lao Tsao) Ph.D. <[email protected]> > Date: Tue, May 17, 2011 at 3:37 PM > To: [email protected] > > > http://www.fujitsu.com/downloads/SPARCE/whitepapers/T5440-wp-e-200907.pdf > show you tha arch diagram > Since , AFAIK, you can not assign specific vcpu to LDOM domain > IMHO, you are chasing a rube goldberg!! > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > > > ---------- > From: [email protected] <[email protected]> > Date: Tue, May 17, 2011 at 3:44 PM > To: [email protected] > > > True - but you can get the I/O domain to be where you want it by a bit of > cunning. > > If we have a freshly installed system with a control domain to be say 8 cpus > it will use cpu 0-7. We want the I/O domain to be on the second socket ( > cpus 64-127) so we need to fill the gap with a dummy domain. > > ldm create dummy > ldm set-vcpu 56 dummy > ldm set-mem 1g dummy > ldm bind dummy > > then create i/O domain > > ldm create secondary > ldm set-vcpu 8 secondary > ldm set-mem 4g secondary > ldm bind secondary > > then delete dummy > ldm unbond dummy > ldm destroy dummy. > -- > > Terry Smith | Principal Sales Consultant > Phone: +44 118 924 000 | Mobile: +44 7802212151 > Oracle UK & Ireland Hardware Systems Sales > Oracle Parkway | Thames Valley Park | Reading | RG6 1RA | United Kingdom > > ORACLE Corporation UK Ltd is a company incorporated in England & Wales | > Company Reg. No. 1782505 | Reg. office: Oracle Parkway, Thames Valley Park, > Reading RG6 1RA > Oracle is committed to developing practices and products that help protect > the environment > > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > > > ---------- > From: Hung-ShengTsao (Lao Tsao) Ph.D. <[email protected]> > Date: Tue, May 17, 2011 at 3:48 PM > To: [email protected] > > > yes, but AFAIK, after the system reboot > these vcpu will change, are I correct? > regards > > _______________________________________________ > ldoms-discuss mailing list > > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > > > ---------- > From: Ben Taylor <[email protected]> > Date: Tue, May 17, 2011 at 3:56 PM > To: "[email protected]" <[email protected]> > Cc: [email protected] > > > On Tue, May 17, 2011 at 2:44 PM, [email protected] > Funny, that's what I've done. I'm just not sure after deleting the > "dummy" that the > appropriate CPU's are still in affinity with the PCI_2 after a reboot. > > ---------- > From: [email protected] <[email protected]> > Date: Tue, May 17, 2011 at 4:17 PM > To: [email protected] > > > Not unless you unbind the domain. > > T > > > > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > > > > > _______________________________________________ > ldoms-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss > _______________________________________________ ldoms-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss
