diff options
| author | Doron Roberts-Kedes <[email protected]> | 2018-08-28 16:33:57 -0700 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2018-08-29 19:57:04 -0700 |
| commit | 0927f71dbcfb59131b289d7d518e9472e51d4830 (patch) | |
| tree | 1db0618375ce8e2d11e28e25aee8d20d78416387 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | 7e8d5755be0e6c92d3b86a85e54c6a550b1910c5 (diff) | |
net/tls: Calculate nsg for zerocopy path without skb_cow_data.
decrypt_skb fails if the number of sg elements required to map it
is greater than MAX_SKB_FRAGS. nsg must always be calculated, but
skb_cow_data adds unnecessary memcpy's for the zerocopy case.
The new function skb_nsg calculates the number of scatterlist elements
required to map the skb without the extra overhead of skb_cow_data.
This patch reduces memcpy by 50% on my encrypted NBD benchmarks.
Reported-by: Vakul Garg <[email protected]>
Reviewed-by: Vakul Garg <[email protected]>
Tested-by: Vakul Garg <[email protected]>
Signed-off-by: Doron Roberts-Kedes <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions