Date: Thu, 10 Apr 2014 13:22:52 +0200 From: Hartmut Brandt <hartmut.brandt@dlr.de> To: Vladislav Prodan <universite@ukr.net> Cc: stable@freebsd.org, hackers@freebsd.org, net@freebsd.org Subject: Re[2]: Some gruesome moments with performance of FreeBSD at over 20K interfaces Message-ID: <alpine.BSF.2.00.1404101316390.52873@KNOP-BEAGLE.kn.op.dlr.de> In-Reply-To: <1397127901.499782177.24smhe7a@frv35.fwdcdn.com> References: <1397077963.756961709.gspkmzvd@frv35.fwdcdn.com> <alpine.BSF.2.00.1404101200320.52873@KNOP-BEAGLE.kn.op.dlr.de> <1397127901.499782177.24smhe7a@frv35.fwdcdn.com>
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On Thu, 10 Apr 2014, Vladislav Prodan wrote: VP>> On Wed, 9 Apr 2014, Vladislav Prodan wrote: VP>> VP>> VP>b) Service bsnmpd started at 12K interfaces, but immediately loaded CPU VP>> VP>at 80-100% VP>> VP>> I could imagine that this is because of the statistics polling. bsnmp VP>> implements 64-bit interface statistics but we have only 32-bit statistics VP>> in the kernel. So it polls the kernel statistics for each interface on a VP>> rate that ensures that 32-bit don't overflow. If the interfaces are GBit VP>> or, worse, 10GBit interfaces the polling rate is rather high (in the order VP>> of seconds). VP>> VP>> You should either make sure that the interfaces report sensible bitrates VP>> (I doubt that 20k interfaces could all be GBit interfaces) or force a slower VP>> polling interval by setting begemotIfForcePoll.0 to some large value. VP>> VP>> harti VP>> VP> VP>Thanks for the tip. VP> VP>At least 10 interfaces to be 1Gb, and the rest no more than 50M. VP>BegemotIfForcePoll parameter in this case a little help, you will be forced to stand another value for Gigabit Interface begemotIfForcePoll ... Yeah. There is only one parameter. You are running -STABLE, right? On current the statistics are 64-bit (I wonder whether the operation on these values is automatically atomic on all our platforms, though). harti
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