Ian Campbell
2014-Aug-31 02:10 UTC
[Pkg-xen-devel] Bug#577788: dom0 kernels should suggest irqbalance
(copying debian-kernel for reasons which will hopefully become obvious) On Mon, 8 Jul 2013 18:10:58 +0200 =?UTF-8?Q?Moritz_M=C3=BChlenhoff?= <jmm at inutil.org> wrote:> In current Debian kernel there's no special Xen dom0 kernel image and depending > on irqbalance in the kernel package would be overkill.Would it? I thought irqbalance is actually required even for native with modern kernels, since the kernel doesn't do any balancing by itself (any more, it did use to). Looking on my laptop for instance I see that all interrupts are going to CPU0 out of the 4 processes. On the other hand my workstation does seem to have balanced IRQs despite having no irqbalanced running, so I don't know. I reckon the kernel probably should recommend irqbalance these days, but in any case there is no reason for Xen to do something different (since IRQ balancing should work as on native). Ian.
Ben Hutchings
2014-Sep-03 23:14 UTC
[Pkg-xen-devel] Bug#577788: dom0 kernels should suggest irqbalance
On Sun, 2014-08-31 at 03:10 +0100, Ian Campbell wrote:> (copying debian-kernel for reasons which will hopefully become obvious) > > On Mon, 8 Jul 2013 18:10:58 +0200 =?UTF-8?Q?Moritz_M=C3=BChlenhoff?= <jmm at inutil.org> wrote: > > In current Debian kernel there's no special Xen dom0 kernel image and depending > > on irqbalance in the kernel package would be overkill. > > Would it? I thought irqbalance is actually required even for native with > modern kernels, since the kernel doesn't do any balancing by itself (any > more, it did use to).I don't know that it's generally required, but it can be useful if there is a lot of work done in interrupt or softirq context (and have multiple processors).> Looking on my laptop for instance I see that all interrupts are going to > CPU0 out of the 4 processes. On the other hand my workstation does seem > to have balanced IRQs despite having no irqbalanced running, so I don't > know. > > I reckon the kernel probably should recommend irqbalance these days, but > in any case there is no reason for Xen to do something different (since > IRQ balancing should work as on native).At least kernels that support SMP could recommend it. Ben. -- Ben Hutchings Experience is directly proportional to the value of equipment destroyed. - Carolyn Scheppner -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 811 bytes Desc: This is a digitally signed message part URL: <http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20140904/8b167e46/attachment.sig>
Ian Campbell
2014-Sep-04 07:10 UTC
[Pkg-xen-devel] Bug#577788: dom0 kernels should suggest irqbalance
Control: reassign -1 src:linux COntrol: retitle -1 SMP kernels should suggest irqbalance On Thu, 2014-09-04 at 00:14 +0100, Ben Hutchings wrote:> On Sun, 2014-08-31 at 03:10 +0100, Ian Campbell wrote: > > (copying debian-kernel for reasons which will hopefully become obvious) > > > > On Mon, 8 Jul 2013 18:10:58 +0200 =?UTF-8?Q?Moritz_M=C3=BChlenhoff?= <jmm at inutil.org> wrote: > > > In current Debian kernel there's no special Xen dom0 kernel image and depending > > > on irqbalance in the kernel package would be overkill. > > > > Would it? I thought irqbalance is actually required even for native with > > modern kernels, since the kernel doesn't do any balancing by itself (any > > more, it did use to). > > I don't know that it's generally required, but it can be useful if there > is a lot of work done in interrupt or softirq context (and have multiple > processors). > > > Looking on my laptop for instance I see that all interrupts are going to > > CPU0 out of the 4 processes. On the other hand my workstation does seem > > to have balanced IRQs despite having no irqbalanced running, so I don't > > know. > > > > I reckon the kernel probably should recommend irqbalance these days, but > > in any case there is no reason for Xen to do something different (since > > IRQ balancing should work as on native). > > At least kernels that support SMP could recommend it.That sounds like a good idea to me. Presumably irqbalanced is mostly harmless for UP kernels, but I think we can avoid that recommends unless the auto-generation of debian/control gets in the way too much. Ian.
Debian Bug Tracking System
2014-Sep-04 07:12 UTC
[Pkg-xen-devel] Processed: Re: dom0 kernels should suggest irqbalance
Processing control commands:> reassign -1 src:linuxBug #577788 [src:xen] dom0 kernels should suggest irqbalance Bug reassigned from package 'src:xen' to 'src:linux'. Ignoring request to alter found versions of bug #577788 to the same values previously set Ignoring request to alter fixed versions of bug #577788 to the same values previously set> retitle -1 SMP kernels should suggest irqbalanceBug #577788 [src:linux] dom0 kernels should suggest irqbalance Changed Bug title to 'SMP kernels should suggest irqbalance' from 'dom0 kernels should suggest irqbalance' -- 577788: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=577788 Debian Bug Tracking System Contact owner at bugs.debian.org with problems
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