Re: performance of jailed processes
From: Pawel Jakub Dawidek (pjd_at_FreeBSD.org)
Date: 03/30/04
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Date: Tue, 30 Mar 2004 21:56:20 +0200 To: Dag-Erling Sm?rgrav <des@des.no>
On Tue, Mar 30, 2004 at 09:09:35PM +0200, Dag-Erling Sm?rgrav wrote:
+> > Can you identify any micro-benchmarks rather than macro-benchmarks that
+> > reflect a significant difference?
+>
+> haven't had much luck with that... fetch, for instance, doesn't seem
+> to suffer, but with mysql the difference is dramatic:
+>
+> (outside jail)
+> 1 row in set (0.01 sec)
+>
+> (inside jail)
+> 1 row in set (13.20 sec)
+>
+> note that 13 seconds is far too short for a DNS issue, and that the
+> time reported is measured *after* login (i.e. after any DNS lookup)
I'm wondering if this piece of code is responsible for this delay:
(sys/netinet/in_pcb.c:551)
if (laddr.s_addr == INADDR_ANY && jailed(socred)) {
bzero(&sa, sizeof(sa));
sa.sin_addr.s_addr = htonl(prison_getip(socred));
sa.sin_len = sizeof(sa);
sa.sin_family = AF_INET;
error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
&laddr.s_addr, &lport, cred);
if (error)
return (error);
}
Maybe you can test it by putting a printf() after this if() and check
if it is printed with fetch and with mysql.
-- Pawel Jakub Dawidek http://www.FreeBSD.org pjd@FreeBSD.org http://garage.freebsd.pl FreeBSD committer Am I Evil? Yes, I Am!
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