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Date: Thu, 11 Dec 2008 09:24:37 +0800 From: "Zhiwen Zheng" <zhiwen.zh@...il.com> To: linux-kernel@...r.kernel.org Subject: Re: IP over Fibre Channel slower than GigaEthernet ? Could someone point me to resources about doing zero copy in kernel, such as RDMA over IP, RDMA over FC , please? 2008/12/10 Zhiwen Zheng <zhiwen.zh@...il.com>: > Hi, > > To compare tcp transport speed of IP over FC to that of GigaEthernet, > I have two machines connected directly with FC or GigaEther, and run > ttcp to get the result. > > configuration of the machines: > kernel version : 2.6.10 > platform : xscale iop80331 500MHz > memory : 512MB DDR2 > FC controller : LSI FC949x (using driver mptlan.c) > GigaEthernet controller : Intel 82546EB > > > In the Ethernet case, the transport speed is about 90MB/s, > and cpu usage is about 90%. > > In the FC case, the transport speed is about 60MB/s, > and cpu usage is also about 90%. > > Could someone tell me why FC is slower than GigaEthernet? > And is it possible to reduce the cpu usage through DMA or something else ? > > Thanks. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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