Re: [RFC PATCH 0/8] virtio: new API for addition of buffers, scatterlist changes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Il 07/02/2013 14:31, Michael S. Tsirkin ha scritto:
> > Single means *this piece* (for example a request header) is single.  It
> > could still end up in an indirect buffer because QEMU does not support
> > mixed direct/indirect buffers.
> 
> Yes but why is the optimization worth it?
> It makes sense if all we want to do is add a single buffer
> in one go, this would give us virtqueue_add_buf_single.
> 
> But if we are building up an s/g list anyway,
> speeding up one of the entries a tiny bit
> seems very unlikely to be measureable.
> No?

There is some optimization potential even in unrolling the loop, but
yes, it looks like I misunderstood.  I'll add virtqueue_add_buf_single
instead.

Paolo

--
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


[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux