Date: Sun, 23 Sep 2018 06:10:40 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Lev Serebryakov <lev@FreeBSD.org>, net@FreeBSD.org Subject: Re: Looks like igb on 12-ALPHA6 (driver 7.6.1-k) and on 11-STABLE (driver 2.5.3-k) behave very differently on receive [regression?] Message-ID: <79b6fb3b-e584-c3d4-d1a4-4a044a5467df@grosbein.net> In-Reply-To: <1083507782.20180923014837@serebryakov.spb.ru> References: <1377072414.20180922235207@serebryakov.spb.ru> <1083507782.20180923014837@serebryakov.spb.ru>
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23.09.2018 5:48, Lev Serebryakov wrote: >> Any hints? > I don't know why, but "server" host could not send more than 710Mbit/s with > Ethernet flow control turned on. Turning flow control off helps. Intel does not recommend MTU over 8.5KB for some NICs supported by igb(4) due to hardware problems: https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/i218-i219-ethernet-connection-spec-update.pdf
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