On 2012-12-13 05:55, Asias He wrote: > Hello Michael, > > On 12/12/2012 06:48 PM, Michael S. Tsirkin wrote: >> Deleting a GSI isn't necessary: it is enough >> to stop using it. Delay flush until an entry is used. >> >> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> >> --- >> kvm-all.c | 2 -- >> 1 file changed, 2 deletions(-) >> >> diff --git a/kvm-all.c b/kvm-all.c >> index 3bc3347..fb3180d 100644 >> --- a/kvm-all.c >> +++ b/kvm-all.c >> @@ -991,8 +991,6 @@ void kvm_irqchip_release_virq(KVMState *s, int virq) >> } >> } >> clear_gsi(s, virq); >> - >> - kvm_irqchip_commit_routes(s); >> } >> >> static unsigned int kvm_hash_msi(uint32_t data) >> > > I tried this patch with vhost-blk with qemu-1.3.0 > 6d6c9f59ca1b1a76ade7ad868bef191818f58819. > > Without the drop of msix_fire_vector_notifier in msix_handle_mask_update > hack > Before: ~20K IOPS > After: ~35K IOPS > > With the drop of msix_fire_vector_notifier in > msix_handle_mask_update hack > Before: ~197K IOPS > After: ~197K IOPS > Is the guest balancing the IRQ(s) between its vCPUs all the time? Jan -- Siemens AG, Corporate Technology, CT RTC ITP SDP-DE Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
