On 04/19/2016 10:02 AM, Denis Ovsienko wrote:
Hello list.
As far as documentation goes, some sense may be presumed in libpcap
calling posix_fadvise() with POSIX_FADV_SEQUENTIAL. This way the OS
would be able to adjust the buffers better to read the .pcap file.
Does anybody have any practical experience with posix_fadvise() to
comment if the gain is ever visible with present day hardware and
OSes?
Well, in the long ago and far away when web server benchmarking was all
the rage, I and others with whom I was working found that getting a web
server to use posix_fadvise() to tell the file system the web server was
no longer interested in trailing sections of its access log was a clear
win for keeping less-frequently but still accessed URLs in the file cache.
If nothing else, if tcpdump isn't doing so already it would be a
worthwhile thing to add to the writing of the capture file. And, for
that matter, just about anything generating logfiles...
happy benchmarking,
rick jones
[Note to moderator: I've updated my subscription to my new email and
cancelled the post that got moderated.]
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