Date: Sun, 28 Dec 2008 22:33:35 +0100 From: Christian Gusenbauer <c47g@gmx.at> To: "Li, Qing" <qing.li@bluecoat.com> Cc: qingli@freebsd.org, freebsd-current@freebsd.org Subject: Re: Network slowdown on lo0 introduced with svn186119/186121 Message-ID: <200812282233.35612.c47g@gmx.at> In-Reply-To: <B583FBF374231F4A89607B4D08578A431442F1@bcs-mail03.internal.cacheflow.com> References: <200812281856.20118.c47g@gmx.at> <B583FBF374231F4A89607B4D08578A431442F1@bcs-mail03.internal.cacheflow.com>
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Hi Qing! Amanda uses two processes which communicate using a localhost-based tcp connection. I assume one of them is dump'ing the partition and sends the blocks to the other process, which stores them on tape or to another hard disk (which is the way I configured it). I did not configure amanda to use the localhost address though. My method of measurement is rather simple: a backup of my root partition (~ 800 MB) lasts about a 3 minutes with a kernel based on revision 186107. Using a kernel based on revision 186121 a backup of the same partition lasts more than 9 hours! I tested kernels of revisions 186133, 186150, 186176 and HEAD of today morning CET - all showing the same slowdown. Revisions 185984, 186061 and 186107 are ok. I did some tests with the 'echo' and 'discard' services of inetd, too, but I was not able to reproduce this slowdown. Many thanks, Christian. On Sunday 28 December 2008, Li, Qing wrote: > Hi Christian, > > Is the loopback address or an address that is assigned to > an interface used by amanda? Would it be possible for you > to give me some information on the tests you performed and > on your method of measurement? > > Thanks, > > -- Qing > > ________________________________ > > From: owner-freebsd-current@freebsd.org on behalf of Christian Gusenbauer > Sent: Sun 12/28/2008 9:56 AM > To: freebsd-current@freebsd.org > Subject: Network slowdown on lo0 introduced with svn186119/186121 > > > > Hi! > > Today I built a new kernel on current and experienced a massive network > slowdown on lo0 when doing a backup using amanda. I made some tests and it > seems that the commits 186119 and 186121 to the svn repository are causing > it. A kernel based on revision 186107 runs fine and all kernels starting > with revison 186119 do not. > > This slowdown seems to appear only on the loopback interface, not on my lan > interface. > > Is this a known issue? > > Regards, > Christian. > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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