* Jens Axboe <[EMAIL PROTECTED]> wrote: > > pick up the threaded softirq patches from -rt, those move all > > softirqs processing into kernel threads. I'd suggest to extend those > > via wakeup-from-remote functionality - it fits the construct quite > > naturally. You should also be able to directly observe any > > performance impact of threaded softirq handlers. (and if you find > > any, let me know so that we can make it faster :-) > > I was just considering that, since I knew -rt moved the softirqs into > threads. I'll look into it, but may not post anything until after my > vacation.
we should more seriously investigate kernel thread scalability for another reason as well: besides -rt, any generic async IO facility we pick up will likely heavily rely on them. Kernel thread scheduling is quite a bit lighter than user task scheduling [no TLB flushes, etc.] - and if it is still not good enough we could probably accelerate them some more. (and everyone will benefit) irq-context softirqs on the other hand are quite rigid and bring in many atomicity assumptions so they are not as natural to program for. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/