Date: Thu, 13 Oct 2005 10:07:34 -0700 From: Sean McNeil <sean@mcneil.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-amd64@freebsd.org, Mike Tancsa <mike@sentex.net> Subject: Re: realtek performance (was Re: good ATI chipset results) Message-ID: <1129223254.9093.3.camel@server.mcneil.com> In-Reply-To: <200510131149.24411.jhb@freebsd.org> References: <6.2.3.4.0.20051013090818.07a5c9a0@64.7.153.2> <1129216390.8681.6.camel@server.mcneil.com> <200510131149.24411.jhb@freebsd.org>
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On Thu, 2005-10-13 at 11:49 -0400, John Baldwin wrote: > On Thursday 13 October 2005 11:13 am, Sean McNeil wrote: > > On Thu, 2005-10-13 at 09:17 -0400, Mike Tancsa wrote: > > > Havent really seen anyone else use this board, but I have had good > > > luck with it so far > > > > > > http://www.ecs.com.tw/ECSWeb/Products/ProductsDetail.aspx?DetailID=506&Me > > >nuID=90&LanID=0 > > > > > > Its a micro ATX formfactor with built in video and the onboard NIC is > > > a realtek. (Although its not the fastest NIC, its driver is stable > > > and mature-- especially compared to the headaches people seem to have > > > with the NVIDIA NICs.) > > > > Is this the RealTek 8169S Single-chip Gigabit Ethernet? > > > > For those interested, here are some changes I always use to increase the > > performance of the above NIC. With these mods, I can stream over 20 > > MBps video multicast and do other stuff over the network without issues. > > Without the changes, xmit is horrible with severe UDP packet loss. > > So, I see two changes. One is to up the number of descriptors from 32 rx and > 64 tx to 64 rx and 64 tx on some models and 1024 rx and 1024 tx on other > modules. The other thing is that you seem to pessimize TX performance by > always forcing the send packets to be coalesced into one mbuf (which requires > doing an alloc and then copying all of the data) instead of making use of > scatter/gatter for sending packets. Do you need both changes or do just the > higher descriptor counts make the difference? Actually, I've found that the higher descriptor counts do not make a noticeable difference. The only thing that mattered was to eliminate the scatter/gather of sending packets. I can't remember why I left the descriptor increase in there. I think it was to get the best use out of the hardware. Sean
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