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Re: Tor on FreeBSD Performance issues Alexander Leidinger Fri Feb 10 03:01:11 2012

Quoting Julian Wissmann <[EMAIL PROTECTED]> (from Wed, 8 Feb 2012 18:33:53 +0100):

1086 tor      RET   read 1568/0x620
  1086 tor      CALL  clock_gettime(0xd,0x7fffffffd910)
  1086 tor      RET   clock_gettime 0
1086 tor CALL kevent(0x3,0x3e18000,0x2,0x3dbe000,0x400,0x7fffffffd920)
  1086 tor      GIO   fd 3 wrote 64 bytes

1086 tor      RET   kevent 3
  1086 tor      CALL  clock_gettime(0x4,0x7fffffffd940)
  1086 tor      RET   clock_gettime 0
  1086 tor      CALL  gettimeofday(0x7fffffffd930,0)
  1086 tor      RET   gettimeofday 0
  1086 tor      CALL  recvfrom(0xbc2,0x4822020,0x3e40,0,0,0)
  1086 tor      GIO   fd 3010 read 4096 bytes

As I understand kevent to be part of queue I go with yes here. What I also take from it is a huge number of clock_gettime() and gettimeofday() calls.

And there you have probably the cause of the slowdown. The clock subsystem in FreeBSD is working at a higher prcession than what you get in FreeBSD. If possible, try to trim down the number of calls, or use a less precise (and faster) clocksource, e.g. one of the _FAST ones (see http://www.freebsd.org/cgi/man.cgi?clock_gettime).

Bye,
Alexander.

--
Corruption is not the No. 1 priority of the Police Commissioner.
His job is to enforce the law and fight crime.
                -- P.B.A. President E. J. Kiernan

http://www.Leidinger.net    Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org       netchild @ FreeBSD.org  : PGP ID = 72077137

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