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authorDaniel Borkmann <dborkman@redhat.com>2014-03-26 14:30:51 +0100
committerDaniel Borkmann <dborkman@redhat.com>2014-03-26 14:42:41 +0100
commitc139e809f8562a2e9a1e24e86abc5a7c6eee6254 (patch)
treeb247674a07c3e2c9cbec803818b24655d5c0d1bb /bpf.vim
parent51168327bf55a604a6560a2c9838ade8209f816a (diff)
trafgen: remove timer-based trigger model
perf reports in mmap case a huge number of kmem_cache_alloc's which seem to stem from triggering signals from kernel to user application, against dummy device: Performance counter stats for 'trafgen -i blub -o dummy0 -n100000000 -k100': <-- mmap case 175,837 kmem:kmem_cache_alloc 14.758900522 seconds time elapsed Performance counter stats for 'trafgen -i blub -o dummy0 -n100000000 -k100 -t0': <-- non-mmap case 707 kmem:kmem_cache_alloc 15.591667364 seconds time elapsed It seems not to case significant number of cache-misses, but it's better to switch to a direct trigger when we cannot fill new frames anymore. After this patch, we see a similar number of kmem_cache_alloc's as in the non-mmap case. This basically renders the kpull interval useless, we can optionally remove it if we don't care about people's scripts. ;-) Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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