Tuesday 20 November 2007 Tarihinde 06:12:21 yazmıştı: > On 32-bit x86, we have CONFIG_IRQBALANCE available, > but not on 64-bit x86. Why not? > > I ask, because this feature seems almost essential to obtaining > reasonable latencies during heavy I/O with fast devices. > > My 32-bit Core2Duo MythTV box drops audio frames without it, > but works perfectly *with* IRQBALANCE. > > My QuadCore box works very well in 32-bit mode with IRQBALANCE, > but responsiveness sucks bigtime when run in 64-bit mode (no IRQBALANCE) > during periods of multiple heavy I/O streams (USB flash drives). > > That's with both the 32 and 64 bit versions of Kubuntu Gutsy, > so the software uses pretty much identical versions either way. > > As near as I can tell, when IRQBALANCE is not configured, > all I/O device interrupts go to CPU#0. > > I don't think our CPU scheduler takes that into account when assigning > tasks to CPUs, so anything sent to CPU0 runs with very high latencies. > > Or something like that. > > Why no IRQ_BALANCE in 64-bit mode ?
Have you tried running irqbalance on userspace? Checkout http://irqbalance.org/ . AFAIK CONFIG_IRQBALANCE is deprecated and eats battery power. Regards, ismail -- Faith is believing what you know isn't so -- Mark Twain - 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/
