>From what I've read in subr_taskqueue.c taskqueue_swi, taskqueue_swi_giant and >taskqueue_fast are all implemented using swi_add which calls ithread_create(). Is there any performance difference between them. Is one of the above or ithread given to bus_setup_intr preferable on the other?
-----Original Message----- From: Andriy Gapon [mailto:[email protected]] Sent: Monday, May 27, 2013 03:18 PM To: Orit Moskovich Cc: Konstantin Belousov; [email protected] Subject: Re: preemptive kernel on 27/05/2013 10:21 Orit Moskovich said the following: > What is actually the difference between deferring a filter routine's work > using an ithread given to bus_setup_intr, or using the global taskqueue_swi > (implemented using interrupt thread)? I think you mean taskqueue_fast. The difference is only in how much code you need to write. I do not think there is any significant difference in the resulting functionality. > What do you mean that the functionality is locked under INTR_FILTER? Please see the code. You have to use option INTR_FILTER to get the behavior I described earlier. > -----Original Message----- > From: Andriy Gapon [mailto:[email protected]] > Sent: Monday, May 27, 2013 10:11 AM > To: Konstantin Belousov > Cc: Orit Moskovich; [email protected] > Subject: Re: preemptive kernel > > on 27/05/2013 09:34 Konstantin Belousov said the following: >> Having both filter and ithread for the same interrupt is apparently >> possible but weird. I do not see anything which would prevent >> interrupt filter from being executed while the ithread is running. >> But again, this is very unusual setup. > > I wouldn't call it weird, but, yes, it is rare. It's a pretty normal > configuration when the filter acts as a filter and the handler acts as a > handler (in ithread). In other words, it would be a replacement for a > configuration where a filter is used and the filter offloads actual work to > non-interrupt context via a e.g. taskqueue. > But, hmm, this functionality is probably locked under INTR_FILTER option. > > -- > Andriy Gapon > -- Andriy Gapon _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
