Re: [LAU] midi triggering delay

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To: david <gnome@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Wednesday, September 9, 2009 - 5:25 am

On Tue, Sep 08, 2009 at 07:17:30PM -1000, david wrote:

Andy's original post contained /proc/interrupts which showed some
sharing was happening. Here's a cut:

16: 380396 233180 IO-APIC-fasteoi uhci_hcd:usb4, yenta
17: 829711 532117 IO-APIC-fasteoi uhci_hcd:usb5, ohci1394, HDA Intel
18: 0 0 IO-APIC-fasteoi mmc0
19: 2 0 IO-APIC-fasteoi ehci_hcd:usb6
20: 18 17 IO-APIC-fasteoi uhci_hcd:usb1
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb2
22: 305246 302929 IO-APIC-fasteoi ehci_hcd:usb3

Sharing interrupts adds a tiny delay to interrupt handling; if this has
truly become significant, there's a design issue somewhere else.

(Shared interrupts with modern kernels are not a huge problem, since the
drivers check to see if the interrupt they have is legitimate before the
kernel chains on to the next driver. It's the waste of that additional
check that people want to avoid.)

--
James Cameron
http://quozl.linux.org.au/
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Messages in current thread:
[LAU] midi triggering delay, andy baxter, (Tue Sep 8, 1:02 am)
Re: [LAU] midi triggering delay, andy baxter, (Sat Sep 12, 9:38 am)
Re: [LAU] midi triggering delay, Clemens Ladisch, (Tue Sep 15, 11:44 am)
Re: [LAU] midi triggering delay, andy baxter, (Thu Sep 17, 6:17 pm)
Re: [LAU] midi triggering delay, Clemens Ladisch, (Tue Sep 22, 8:45 am)
Re: [LAU] [Alsa-user] midi triggering delay, andy baxter, (Sat Sep 19, 3:43 pm)
Re: [LAU] midi triggering delay, , (Fri Sep 18, 11:08 am)
Re: [LAU] midi triggering delay, andy baxter, (Wed Sep 9, 4:28 pm)
Re: [LAU] midi triggering delay, andy baxter, (Wed Sep 9, 5:42 pm)
Re: [LAU] midi triggering delay, James Cameron, (Thu Sep 10, 4:17 am)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 4:15 pm)
Re: [LAU] midi triggering delay, Norval Watson, (Tue Sep 8, 11:49 pm)
Re: [LAU] midi triggering delay, Paul Remmers, (Tue Sep 8, 6:00 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 6:37 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 7:00 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 9:18 am)
Re: [LAU] midi triggering delay, James Cameron, (Tue Sep 8, 9:54 am)
Re: [LAU] midi triggering delay, david, (Tue Sep 8, 6:30 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 6:38 pm)
Re: [LAU] midi triggering delay, david, (Wed Sep 9, 5:17 am)
Re: [LAU] midi triggering delay, James Cameron, (Wed Sep 9, 5:25 am)
Re: [LAU] midi triggering delay, andy baxter, (Wed Sep 9, 8:28 am)
Re: [LAU] midi triggering delay, david, (Wed Sep 9, 9:19 am)
Re: [LAU] midi triggering delay, andy baxter, (Wed Sep 9, 10:54 am)
Re: [LAU] midi triggering delay, david, (Thu Sep 10, 7:45 pm)
Re: [LAU] midi triggering delay, Clemens Ladisch, (Fri Sep 11, 8:01 am)
Re: [LAU] midi triggering delay, Rui Nuno Capela, (Wed Sep 9, 11:13 am)
Re: [LAU] midi triggering delay, andy baxter, (Wed Sep 9, 11:26 am)
Re: [LAU] midi triggering delay, Philippe Hezaine, (Tue Sep 8, 6:59 pm)
Re: [LAU] midi triggering delay, david, (Wed Sep 9, 5:18 am)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 7:06 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 4:55 pm)
Re: [LAU] midi triggering delay, , (Tue Sep 8, 7:14 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 1:48 pm)
Re: [LAU] midi triggering delay, , (Tue Sep 8, 2:14 pm)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 3:20 pm)
Re: [LAU] midi triggering delay, James Cameron, (Tue Sep 8, 2:20 am)
Re: [LAU] midi triggering delay, andy baxter, (Tue Sep 8, 7:00 am)