Date: Fri, 22 Jan 2021 12:27:45 +0300 From: Victor Gamov <vit@otcnet.ru> To: freebsd-net@freebsd.org Subject: Re: 'dropped due to full socket buffers' by SNMP Message-ID: <427b5ef6-9558-22ad-6088-c852bf234d13@otcnet.ru> In-Reply-To: <888c8e91-c8f2-ad4b-9fcf-64c09432f2d5@otcnet.ru> References: <388da9a7-7b89-89b2-54eb-17d0e818c924@otcnet.ru> <4e41c1d2-19bc-0345-0b03-526e4cb785c7@otcnet.ru> <b279e676-c789-2978-98a0-b8a4b164a111@grosbein.net> <a69d872a-f21e-de66-7677-58beccb0f023@otcnet.ru> <6c780827-e764-8053-356b-a921e0892c15@grosbein.net> <fef04bda-6aa0-4a80-8999-867b9f37d766@otcnet.ru> <7e51a6be-aea1-51c6-c0bd-10d00c19d5d3@grosbein.net> <888c8e91-c8f2-ad4b-9fcf-64c09432f2d5@otcnet.ru>
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Hi All On 05.01.2021 12:39, Victor Gamov wrote: > Hi Eugene! > > Thanks for your responces. > > And Happy New Year for everyone! > > On 01.01.2021 03:19, Eugene Grosbein wrote: >> 30.12.2020 23:08, Victor Gamov wrote: >> >>> As I understand hw.ix.flow_control=3 to allow flow-control for >>> negotiation. >>> Real PAUSE setting will be set during negotiation. >> >> At the moment of congestion. > > As I understand PAUSE feature negotiated during auto-negotiation > process. If flow-control disabled on one side (switch for example) then > other side (host) will not to use this feature too. Is it right? > >>> So where I can find active flow-control setting for host interface? >> >> Can't check for ix just now, but for em(4) there is sysctl dev.em.0.fc. >> It should be similar for ix. > > I have hw.ix.flow_control=3 (what does is it means ?) and dev.ix.0.fc=3 > (and what does is it means?) > > >>>> maybe increase kern.ipc.maxsockbuf and then net.inet.udp.recvspace. >>> Eugene, at first message you suppose Host-A (sender) "outgoing link >>> for that UDP packets is congested" >>> because this host shows non-zero "dropped due to full socket buffers". >>> So is net.inet.udp.recvspace increasing on Host-B (mainly receiver) >>> will be affected for this congestion? >> >> Can't tell in details without going deep into your setup :-) >> You can try it yourself and verify quickly. >> >>> Or I need to try to increase both kern.ipc.maxsockbuf and >>> net.inet.udp.recvspace on both hosts? >> >> Tune one that drops UDP. >> >>> Also how I can check current sockbuf usage? >> >> netstat -xn > > Unfortunately it never shoes counters about UDP multicast traffic. > > I'll increase kern.ipc.maxsockbuf and net.inet.udp.recvspace at next > week and write about results. I increase kern.ipc.maxsockbuf from 2097152 -> 2597152 -> 3145728 but netstat -sn -p udp | grep 'dropped due to full socket buffers' still show dropped packets. Then I increase net.inet.udp.recvspace 84160 -> 105200 but 'dropped due to full socket buffers' packets still here. Do I need to try to increase something else? -- CU, Victor Gamov
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