Date: Tue, 15 Sep 2015 11:40:27 -0700 From: Adrian Chadd <adrian.chadd@gmail.com> To: Hans Petter Selasky <hps@selasky.org> Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <royger@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@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: <CAJ-Vmo=J7-bM_kV0PD2%2BiWqBLLi24S4KjubuExOhn26j62zr9A@mail.gmail.com> In-Reply-To: <55F864C2.9030102@selasky.org> References: <201409220827.s8M8RRHB031526@svn.freebsd.org> <55F69093.5050807@FreeBSD.org> <55F6935C.9000000@selasky.org> <55F6A694.7020404@FreeBSD.org> <55F6A914.6050109@selasky.org> <55F6ED8F.5030402@FreeBSD.org> <CAJ-Vmo=vq6NbUNecTvkzDLQW3rQzpPToFGbR9TxdcyO_BL3s_g@mail.gmail.com> <55F7FE1A.3050500@selasky.org> <CAJ-VmonsGdG9eddWLLPTG3wwW3FDHDkH-F2xD%2B2nt=yvwBRS-A@mail.gmail.com> <55F864C2.9030102@selasky.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 15 September 2015 at 11:34, Hans Petter Selasky <hps@selasky.org> wrote: > Hi Adrian, > > On 09/15/15 19:13, Adrian Chadd wrote: >> >> I know all of this. What I'm asking is different - what about the >> change(s) that broke/fixed the Xen network performance actually caused >> the change in behaviour? I know things are sensitive to how the mbufs >> are broken up - I'd like to see exactly this. > > > You need to add statistic counters to the network drivers in question, how > frequently packets are defragged and/or dropped in the TX path to figure > that out. Can we continue this discussion elsewhere? Sure thing. Yes, maybe having a per-interface histogram of mbuf / segment sizes would be good - something we can run live on a box rather than trying to use dtrace. I wonder how difficult it'd be to slip something in as part of if_transmit and ifnet.. -adrian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-Vmo=J7-bM_kV0PD2%2BiWqBLLi24S4KjubuExOhn26j62zr9A>