Hi Eric, Eric W. Biederman wrote:
Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> writes:- define NR_IRQS as follow: Vector domain can provide the number of irqs being proportional to the number of CPUs theoretically. However, the relation between them is actually not linear, especially in large system. To avoid the memory consumption derived from too many irqs, I define NR_IRQS as follows: #if (NR_VECTORS + 32 * NR_CPUS) < 1024 #define NR_IRQS (NR_VECTORS + 32 * NR_CPUS) #else #define NR_IRQS 1024 #endifBelow is my old patch to address this in a different way. Basically this moves the per cpu counter of the number of times an irq has happened on an individual cpu out of the per cpu area. Honestly I think this might even have better cache performance.
Sorry for my late reply. I overviewed your patch and the patch looks good to me. It can improve not only ia64 vector domain but also x86_64 vector domain. I'll consider testing the patch after rebasing it, and if it'll be OK, including your idea (or similar one) into my patchset. BTW, I googled to find the discussion related to your patch, but can't find it at all. Where did you submit it to? Thanks, Yasuaki Ishimatsu - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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