sunvnet: make transmit path zero-copy in the kernel

Browse source

This patch removes pre-allocated transmit buffers and instead directly maps
pending packets on demand. This saves O(n^2) maximum-sized transmit buffers,
for n hosts on a vswitch, as well as a copy to those buffers.

Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU,
but linux-linux at 1500-bytes increased ~20%.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

David L Stevens 2014-09-29 19:48:11 -04:00 • committed by David S. Miller

parent e4defc7754

commit 8e845f4cbb

2 changed files with 182 additions and 45 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

218

drivers/net/ethernet/sun/sunvnet.c

View file

9

drivers/net/ethernet/sun/sunvnet.h

View file