Messages in this thread |  | | Date | Wed, 3 Oct 2001 16:41:56 -0400 (EDT) | From | Jeremy Hansen <> | Subject | Re: [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5 |
| |
I better go check my pants...
Thanks -jeremy
On Wed, 3 Oct 2001, Linus Torvalds wrote:
> In article <Pine.LNX.4.33.0110031920410.9973-100000@localhost.localdomain>, > Ingo Molnar <mingo@elte.hu> wrote: > > > >well, just tested my RAID testsystem as well. I have not tested heavy > >IO-related IRQ load with the patch before (so it was not tuned for that > >test in any way), but did so now: an IO test running on 12 disks, (5 IO > >interfaces: 3 SCSI cards and 2 IDE interfaces) producing 150 MB/sec block > >IO load and a fair number of SCSI and IDE interrupts, did not trigger the > >overload code. > > Now test it again with the disk interrupt being shared with the network > card. > > Doesn't happen? It sure does. It happens more often especially on > slightly lower-end machines (on laptops it's downright disgusting how > often _every_ single PCI device ends up sharing the same interrupt). > > And as the lower-end machines are the ones that probably can be forced > to trigger the whole thing more often, this is a real issue. > > And on my "high-end" machine, I actually have USB and ethernet on the > same interrupt. It would be kind of nasty if heavy network traffic > makes my camera stop working... > > The fact is, there is never any good reason for limiting "trusted" > interrupts, ie anything that is internal to the box. Things like disks, > graphics controllers etc. > > Which is why I like the NAPI approach. If somebody overloads my network > card, my USB camera doesn't stop working. > > I don't disagree with your patch as a last resort when all else fails, > but I _do_ disagree with it as a network load limiter. > > Linus > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
-- The trouble with being poor is that it takes up all your time.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |