Date: Sat, 1 Mar 2008 16:08:02 +0100 (CET) From: Ingo Flaschberger <if@xip.at> To: Willem Jan Withagen <wjw@digiware.nl> Cc: alves <daniel@dgnetwork.com.br>, freebsd-net@freebsd.org, freebsd-performance@freebsd.org, "=?x-unknown?B?IkRhbmllbA==?= Dias =?x-unknown?B?R29uw6ci?="@FreeBSD.ORG, Kevin Oberman <oberman@es.net> Subject: Re: FBSD 1GBit router? Message-ID: <alpine.LFD.1.00.0803011603430.20402@filebunker.xip.at> In-Reply-To: <47C93E8B.3010609@digiware.nl> References: <20080226003107.54CD94500E@ptavv.es.net> <alpine.LFD.1.00.0802260132240.9719@filebunker.xip.at> <47C8964C.9080309@digiware.nl> <alpine.LFD.1.00.0803010137041.13659@filebunker.xip.at> <47C93E8B.3010609@digiware.nl>
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>> Thats why my next router will be based at this box: >> http://www.axiomtek.com/products/ViewProduct.asp?view=429 > > Nice piece of hardware. > Don't like the 2.5" one disk option though. > > And not shure what to think of: > "Seven 10/100/1000Mbps (through PCI-E by one > interface) ports (RJ-45)" > Which seems to suggest everything comes in thru on PCI-E interface. > That than better have 8 or 16 lanes. Each 1000Mbps port is connected via 1 lane PCI-E, which is fast enough. 1 lane: 250Mbyte/sec -> 2Gpbs >> Hopefully there will be direct memory bus connected nic's in future. >> (HyperTransport connected nic's) > > Well that is going to be an AMD only solution, and I'm not even shure > that AMD would like to have other things than CPU's on that bus. > >> >>> What it does not explain is why you can only get 80Mb/s with 64byte >>> packets, which would suggest other bottlenecks than just the bus. >> >> Perhaps something with interrupts: >> http://books.google.at/books?id=pr4fspaQqZkC&pg=PA144&lpg=PA144&dq=pci+interrupt+delay&source=web&ots=zbvVU2CgVx&sig=APe9YjdtK35ccnow7BDI2hzie7s&hl=de#PPA144,M1 >> >> >> >> MSI (Message-signalled Interrupts) are not very common on PCI architekture; >> PCI-E use only MSI. >> >> The kpps keept always around 100, equally if I used fast-forwarding, >> fast-interrupts, or higher HZ values than 1000HZ. > > MSI is not used for regular PCI busses.Could be that PCI-E does use it. > I believe youon that. But even than I'd like to know where the bottleneck is > in the 100kp/s limit with 64byte pakkets. As I also tested with polling (currently I use interface polling for the router) and also reached only 100kpps, the bottleneck must be someting different. >> But 100kpps is great for a router hardware of about 600eur. > > I've seen routers 10 times that expensive, not able to that. me too. Kind regards, Ingo Flaschberger
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