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authorRusty Russell <rusty@rustcorp.com.au>2008-07-25 13:06:01 -0400
committerRusty Russell <rusty@rustcorp.com.au>2008-07-24 22:06:02 -0400
commitfb6813f480806d62361719e84777c8e00d3e86a8 (patch)
tree800f68b515a39b554ed3a852ba36ea54c1beef8c /include
parent97402b96f87c6e32f75f1bffdd91a5ee144b679d (diff)
virtio: Recycle unused recv buffer pages for large skbs in net driver
If we hack the virtio_net driver to always allocate full-sized (64k+) skbuffs, the driver slows down (lguest numbers): Time to receive 1GB (small buffers): 10.85 seconds Time to receive 1GB (64k+ buffers): 24.75 seconds Of course, large buffers use up more space in the ring, so we increase that from 128 to 2048: Time to receive 1GB (64k+ buffers, 2k ring): 16.61 seconds If we recycle pages rather than using alloc_page/free_page: Time to receive 1GB (64k+ buffers, 2k ring, recycle pages): 10.81 seconds This demonstrates that with efficient allocation, we don't need to have a separate "small buffer" queue. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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