Date: Tue, 1 Dec 2009 12:16:43 -0800 From: William Taylor <williamt@corp.sonic.net> To: freebsd-questions@freebsd.org Subject: Re: tcp delays in jails Message-ID: <16E3B0DF-4AD1-4CA6-BC25-124A4A82EA12@corp.sonic.net> In-Reply-To: <hf2te0$h9b$1@ger.gmane.org> References: <63450BC7-7E22-4448-B030-63F34AD00749@corp.sonic.net> <hf2te0$h9b$1@ger.gmane.org>
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On Dec 1, 2009, at 3:07 AM, Ivan Voras wrote: > William Taylor wrote: >> I recently started having a problem with tcp connections in one of my = jails. >> Im running 4.9-stable >=20 > I guess it will not do any good to tell you to upgrade to 8.0? :) >=20 Not at this time although I probably should eventually. I still have = a 3.5-STABLE box kicking around. I have always been a believer of if it isn't broken don't fix it. >> both sendmail and perdition experience the same problem. I even tried = stopping >> everything on the box and the problem still persists. >=20 > Just to verify - the problem is on the side of the servers (TCP = listeners)? >=20 Seems to be. I could write a small tcp server and see if I can get it = to exhibit the same behavior or not. >> Connections to other jails on different ip's on the same box are = fine. >> There seems to be about a 5 second delay. >> =46rom this snippet of a ktrace I did you can see what looks to be a = delay of about 5 seconds after the CALL kevent >=20 > I'm not sure what you are tracing but this trace looks like something = having to do with DNS. >=20 > Does DNS resolve properly on the box? Reverse DNS also? Some servers, = ssh and probably sendmail also, do a reverse DNS lookup on the = connecting client. > Just the generic ones... try seeing if DNS and reverse DNS work first. >=20 >=20 Yes DNS is resolving properly forward and reverse. I even tried changing = DNS servers.
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