diff options
| author | Eric Dumazet <[email protected]> | 2011-01-10 20:11:38 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <[email protected]> | 2011-01-10 20:11:38 +0100 |
| commit | 83723d60717f8da0f53f91cf42a845ed56c09662 (patch) | |
| tree | 9d32edc2c6dc4849e63d422f8dad42606b2f984f /tools/perf/util/trace-event-scripting.c | |
| parent | 45b9f509b7f5d2d792b3c03b78ddc8ec543e921b (diff) | |
netfilter: x_tables: dont block BH while reading counters
Using "iptables -L" with a lot of rules have a too big BH latency.
Jesper mentioned ~6 ms and worried of frame drops.
Switch to a per_cpu seqlock scheme, so that taking a snapshot of
counters doesnt need to block BH (for this cpu, but also other cpus).
This adds two increments on seqlock sequence per ipt_do_table() call,
its a reasonable cost for allowing "iptables -L" not block BH
processing.
Reported-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
CC: Patrick McHardy <[email protected]>
Acked-by: Stephen Hemminger <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions