Date: Wed, 07 Oct 2009 19:58:17 +0500 From: rihad <rihad@mail.ru> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets Message-ID: <4ACCAC89.1040805@mail.ru> In-Reply-To: <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org> References: <4AC9E29B.6080908@mail.ru> <20091005123230.GA64167@onelab2.iet.unipi.it> <4AC9EFDF.4080302@mail.ru> <4ACA2CC6.70201@elischer.org> <4ACAFF2A.1000206@mail.ru> <4ACB0C22.4000008@mail.ru> <20091006100726.GA26426@svzserv.kemerovo.su> <4ACB42D2.2070909@mail.ru> <20091006142152.GA42350@svzserv.kemerovo.su> <4ACB6223.1000709@mail.ru> <20091006161240.GA49940@svzserv.kemerovo.su> <alpine.BSF.2.00.0910061804340.50283@fledge.watson.org> <4ACC5563.602@mail.ru> <4ACC56A6.1030808@mail.ru> <alpine.BSF.2.00.0910070957430.58146@fledge.watson.org> <4ACC5DEC.1010006@mail.ru> <alpine.BSF.2.00.0910071036280.58146@fledge.watson.org> <4ACC65A0.7030900@mail.ru> <alpine.BSF.2.00.0910071312420.58146@fledge.watson.org> <4ACC8CC8.8050403@mail.ru> <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org>
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Robert Watson wrote: > In the driver init code in if_bce, the following code appears: > > ifp->if_snd.ifq_drv_maxlen = USABLE_TX_BD; > IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen); > IFQ_SET_READY(&ifp->if_snd); > > Which evaluates to a architecture-specific value due to varying > pagesize. You might just try forcing it to 1024. > In dev/bce/if_bcereg.h: #define TX_PAGES 2 #define TOTAL_TX_BD_PER_PAGE (BCM_PAGE_SIZE / sizeof(struct tx_bd)) #define USABLE_TX_BD_PER_PAGE (TOTAL_TX_BD_PER_PAGE - 1) #define TOTAL_TX_BD (TOTAL_TX_BD_PER_PAGE * TX_PAGES) #define USABLE_TX_BD (USABLE_TX_BD_PER_PAGE * TX_PAGES) #define MAX_TX_BD (TOTAL_TX_BD - 1) meaning that ifq_drv_maxlen is expected to end up smaller than MAX_TX_BD. What if MAX_TX_BD is itself way smaller than 1024?
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