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Re: SVN 1.5.6 Performance Issues

Author markphip
Full name Mark Phippard
Date 2010-11-12 07:20:29 PST
Message We should clarify some terminology.

I would suggest never using "svnserver". The problem is that Subversion has
two server options: Apache and "svnserve". So by using "svnserver" it
sounds like you mean "svnserve"

You said you are using SSL and LDAP, so I am reasonably certain that you are
using Apache.

Here are a couple ideas:

1) What are your mod_ssl settings? Do you specify a SSLRandomSeed directive
in your httpd.conf?

http://httpd.apache.​org/docs/2.2/mod/mod​_ssl.html#sslrandoms​eed

It looks like it provides some options to avoid any entropy problems. I am
not sure if SVN has any need for random numbers on its own when using
Apache. I do not think it does. So however you configure mod_ssl should
control your exposure here.

BTW, these docs suggest that anytime /dev/random has less than 512 bytes you
could be blocked.

2) It seems like LDAP is worth looking at too. Maybe the server gets
stalled authenticating via LDAP.

I would suggest setting the Apache log level to DEBUG for a while and see if
anything of interest is in the error log at the time someone reports a
problem. I think entropy-type problems might show in this log if you are
using DEBUG logging.

Mark



On 11/12/10 10:11 AM, "Will Nickerson" <XXXX@XXXX>
wrote:

> After some review this morning I've found that kernel.random.entropy_avail
> regularly makes it's way down to almost 0 but never quite reaches 0. It stays
> steady at whatever value it lands at < 10 until svnserver activity . When
> svnserver is idle this value is > 3900.
>
> Does anyone know if this is expected behavior or if this is a symptom of
> entropy starvation?
>
> --------------------​--------------------​--------------
> http://subversion.op​en.collab.net/ds/vie​wMessage.do?dsForumI​d=3&dsMessageId=​39
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Subject
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Date posted
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SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-11 13:22:10 PST
     RE: SVN 1.5.6 Performance Issues jrepenning Jack Repenning 2010-11-11 13:46:49 PST
         RE: SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-11 14:15:42 PST
     RE: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-11 14:54:55 PST
         RE: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-11 15:05:04 PST
         Re: SVN 1.5.6 Performance Issues jrepenning Jack Repenning 2010-11-11 17:06:29 PST
         RE: SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-11 19:15:38 PST
             RE: SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-12 07:11:13 PST
                 Re: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-12 07:20:29 PST
                     RE: Re: SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-12 11:04:40 PST
                         RE: Re: SVN 1.5.6 Performance Issues wilnic Will Nickerson 2010-11-12 12:39:45 PST
                             RE: Re: SVN 1.5.6 Performance Issues arthurgreenfield Arthur Greenfield 2010-11-17 08:39:33 PST
                                 Re: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-17 08:56:08 PST
                                     RE: Re: SVN 1.5.6 Performance Issues arthurgreenfield Arthur Greenfield 2010-11-17 09:48:33 PST
                                         Re: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-17 09:59:02 PST
                                             RE: Re: SVN 1.5.6 Performance Issues arthurgreenfield Arthur Greenfield 2010-11-17 10:12:56 PST
                                                 Re: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-17 10:15:47 PST
                                                     RE: Re: SVN 1.5.6 Performance Issues arthurgreenfield Arthur Greenfield 2010-11-17 10:46:21 PST
                                                         Re: SVN 1.5.6 Performance Issues markphip Mark Phippard 2010-11-17 10:47:33 PST
                                                             RE: Re: SVN 1.5.6 Performance Issues arthurgreenfield Arthur Greenfield 2010-11-17 10:57:45 PST
                                                                 RE: Re: SVN 1.5.6 Performance Issues jrepenning Jack Repenning 2010-11-17 11:47:24 PST
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