Re: strange response time question
Yuxin Ren <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.devel |
|---|---|
| Message-ID | <CAAKbDrekh_cdv8z5+NCktgw__AJ2MOqpfjUqBDYutfiuCDYXFg@mail.gmail.com> |
Hi, Sorry, it's my typo. The worse case is 200us. In my test, before the client sends IPC, I record the time using rdtsc. When the server receives this IPC, I also do rdtsc. The difference between this is the response time. I run this many iterations and the maximum value is the worse case result. I filter out the timer interrupt, but do not flush the cache and tlb. Thank you very much, Yuixn On Tue, Aug 5, 2014 at 4:41 PM, Adam Lackorzynski <[email protected] > wrote: > On Tue Aug 05, 2014 at 13:03:51 -0400, Yuxin Ren wrote: > > Now I am testing the response time in Fiasco, especially for the worse > case. > > The results are strange. > > The worse case result are always around 2us. > > I have filtered out the timer interrupt, so I cannot understand what > > happened. > > I am using intel IA32 multi core cpu. > > Do you have any idea about what can cause the 2us delay? > > For worst case, 2µs does not seem bad to me for this type of CPU. How > did you try to get the worst case (or do you mean something different > with 'worse case'?)? > > > > Adam > -- > Adam [email protected] > Lackorzynski http://os.inf.tu-dresden.de/~adam/ > > _______________________________________________ > l4-hackers mailing list > [email protected] > http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers > _______________________________________________ l4-hackers mailing list [email protected] http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers