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List:       freebsd-hackers
Subject:    Re: Fwd: Abyssmal dump cache efficiency
From:       Eugene Grosbein <eugen () www ! svzserv ! kemerovo ! su>
Date:       2007-02-23 3:56:17
Message-ID: 20070223035617.GA18955 () svzserv ! kemerovo ! su
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On Thu, Feb 22, 2007 at 12:37:00PM -0500, Zaphod Beeblebrox wrote:

> >Peter Jeremy wrote:
> >> I've found that you do get a worthwhile improvement in dump|restore
> >> performance by introducing a large (10's of MB) fifo between them.
> >> This helps reduce synchronisation between dump and restore (so that
> >> dump can continue to read whilst restore is busy writing a batch of
> >> small files and vice versa).  There's a suitable port but I can't
> >> recall the name because I wrote my own.
> >
> >There are several.  The most popular ones are probably
> >misc/team and misc/buffer.
> 
> I can certainly vouch for that , too.  I generally use "team 1m 32" (total
> of 32meg of buffer).  Team seems to not want to buffer more than 1m per
> process and I think 32 is the max # of processes.

Someone, please take a look at trivial patch for team's buffer size here:
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/106806

The maintainer timeout for the PR has occured long time ago.

Eugene Grosbein
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