Date: Tue, 15 Sep 2015 10:42:26 +0200 From: Hans Petter Selasky <hps@selasky.org> To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <royger@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r271946 - in head/sys: dev/oce dev/vmware/vmxnet3 dev/xen/netfront kern net netinet ofed/drivers/net/mlx4 sys Message-ID: <55F7D9F2.3020207@selasky.org> In-Reply-To: <55F7D783.1080406@FreeBSD.org> References: <201409220827.s8M8RRHB031526@svn.freebsd.org> <55F69093.5050807@FreeBSD.org> <55F6935C.9000000@selasky.org> <55F7D783.1080406@FreeBSD.org>
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On 09/15/15 10:32, Roger Pau Monné wrote: > El 14/09/15 a les 11.29, Hans Petter Selasky ha escrit: >> On 09/14/15 11:17, Roger Pau Monné wrote: >>> El 22/09/14 a les 10.27, Hans Petter Selasky ha escrit: >> Hi Roger, >> >> Looking at the netfront code you should subtract 1 from tsomaxsegcount >> prior to r287775. The reason might simply be that 2K clusters are used >> instead of 4K clusters, causing m_defrag() to be called. >> >>> ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + >>> ETHER_VLAN_ENCAP_LEN); >>> ifp->if_hw_tsomaxsegcount = MAX_TX_REQ_FRAGS; >>> ifp->if_hw_tsomaxsegsize = PAGE_SIZE; >> >> After r287775 can you try these settings: >> >> ifp->if_hw_tsomax = 65536; >> ifp->if_hw_tsomaxsegcount = MAX_TX_REQ_FRAGS; >> ifp->if_hw_tsomaxsegsize = PAGE_SIZE; >> >> And see if the performance is the same like before? > > FWIW, just using r287775 seems to solve the problem, even if I leave > if_hw_tsomax with it's current value. > That's expected. Thank you for testing. --HPS
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