Hi Mark, On Fri, Jul 10, 2015 at 10:31 AM, Mark Burton <mark.bur...@greensocs.com> wrote: > <big snip> > To be clear, for a normal user (e.g. they boot linux, they run some apps, > etc)..., if they use only one core, is it true that they will see no > difference in performance?
I didn't test the one core scenario, but I expect less than 10% of degradation of this solution compared to upstream (confirmed by a quick test booting Linux). Actually the performance of these patches for a unicore system can be improved, I will keep this in mind for the next release. > For a ‘normal user’ who does use multi-core, are you saying that a typical > boot is slower? Slower than what? Regards, alvise > > Cheers > > Mark. > >> On 10 Jul 2015, at 10:23, Alvise Rigo <a.r...@virtualopensystems.com> wrote: >> >> * Performance considerations >> This implementation shows good results while booting a Linux kernel, >> where tons of flushes affect the overall performance. A complete ARM >> Linux boot, without any filesystem, requires 30% longer if compared to >> the mttcg implementation, benefiting however of being capable to offer >> the infrastructure to handle atomic instructions on any architecture. >> Instead compared to the current TCG upstream, it is 40% faster with four >> vCPUs and 2.1 times faster with 8 vCPUs. >> In addition, there is still margin to improve such performance, since at >> the moment TLB is flushed quite often, probably more than the required. > > > +44 (0)20 7100 3485 x 210 > +33 (0)5 33 52 01 77x 210 > > +33 (0)603762104 > mark.burton > > > >
