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sfc: Set default parallelism to per-core by default 

The previous default of per-package can be more CPU-efficient, but
users generally seem to prefer per-core.  It should also allow
accelerated RFS to direct packets more precisely, if IRQ affinity
is properly spread out.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2011-12-20 01:08:05 +00:00
parent fa142b9da3
commit cdb08f8fd8
1 changed files with 7 additions and 7 deletions
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14
drivers/net/ethernet/sfc/efx.c
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@ -162,7 +162,7 @@ static unsigned int interrupt_mode;
* interrupt handling.
*
* Cards without MSI-X will only target one CPU via legacy or MSI interrupt.
* The default (0) means to assign an interrupt to each package (level II cache)
* The default (0) means to assign an interrupt to each core.
*/
static unsigned int rss_cpus;
module_param(rss_cpus, uint, 0444);
@ -1148,14 +1148,14 @@ static void efx_fini_io(struct efx_nic *efx)
static int efx_wanted_parallelism(void)
{
cpumask_var_t core_mask;
cpumask_var_t thread_mask;
int count;
int cpu;
if (rss_cpus)
return rss_cpus;
if (unlikely(!zalloc_cpumask_var(&core_mask, GFP_KERNEL))) {
if (unlikely(!zalloc_cpumask_var(&thread_mask, GFP_KERNEL))) {
printk(KERN_WARNING
"sfc: RSS disabled due to allocation failure\n");
return 1;
@ -1163,14 +1163,14 @@ static int efx_wanted_parallelism(void)
count = 0;
for_each_online_cpu(cpu) {
if (!cpumask_test_cpu(cpu, core_mask)) {
if (!cpumask_test_cpu(cpu, thread_mask)) {
++count;
cpumask_or(core_mask, core_mask,
topology_core_cpumask(cpu));
cpumask_or(thread_mask, thread_mask,
topology_thread_cpumask(cpu));
}
}
free_cpumask_var(core_mask);
free_cpumask_var(thread_mask);
return count;
}