Date: Wed, 18 Jul 2018 22:39:34 -0700 From: Kevin Bowling <kevin.bowling@kev009.com> To: Lev Serebryakov <lev@freebsd.org> Cc: Eugene Grosbein <eugen@grosbein.net>, FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: [REGRESSION] Fresh CURRENT consume much more CPU on network traffic (vlans + routing + ipfw with NAT) Message-ID: <CAK7dMtCYO2ae7phBeHAk7w7TeB1_LxZVX6SeXCF2jxk9_du-0w@mail.gmail.com> In-Reply-To: <eff19579-4c09-8530-1eaf-62185315be7d@FreeBSD.org> References: <6d8b301b-8ee9-0e8b-80b5-6aced15ca843@FreeBSD.org> <5B4DA0B0.8020302@grosbein.net> <eff19579-4c09-8530-1eaf-62185315be7d@FreeBSD.org>
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This sounds like a known quirk of the Atom CPU architecture and iflib -- can you try this patch https://reviews.freebsd.org/D16302 it should help specifically on your hardware. Regards, Kevin On Tue, Jul 17, 2018 at 6:03 AM, Lev Serebryakov <lev@freebsd.org> wrote: > On 17.07.2018 10:54, Eugene Grosbein wrote: > >>> I have "SOHO" router on Atom D2500 with FreeBSD CURRENT. It runs >>> CURRENT for very long time (from 11-CURRENT times), and recently it >>> start to consume much more CPU on same traffic =E2=80=94 to the point w= hen it >>> becomes unresponsive in shell (via ssh, not local console). >>> >>> I have rather complex ipfw ruleset, but this ruleset is the same for >>> many years. >>> >>> Revisions before r333989 worked normally, I never seen any problem wit= h >>> shell, no matter how much traffic is processed >>> >>> Revision r334649 with same configuration, same firewall ruleset, etc., >>> becomes completely unresponsive under network load (pure transit traffi= c). >>> >>> when system is unresponsive I see this in `top -SH` >>> >>> 100083 root -76 - 0K 272K - 1 291.8H 95.31% kernel{if_io_tqg_1= } >>> 100082 root -76 - 0K 272K - 0 297.7H 95.20% kernel{if_io_tqg_0= } >>> >>> And it is new to me. >> >> I'm sure you will get it solved more quick if you perform bisection of r= evision >> even though it will take time. > I'll try latest version (seems here were a lot of commit to iflib after > my revision) and after that try yo bisect. > > -- > // Lev Serebryakov >
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