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Date: Thu, 21 Apr 2011 10:02:40 +0200 From: Michal Simek <monstr@...str.eu> To: juice@...gman.org CC: netdev@...r.kernel.org Subject: Re: Hight speed data sending from custom IP out of kernel juice wrote: > Hi! > > I can see you are probably going to run into CPU performance problems, but > it depends a lot on the type of traffic you are going to send. > > My system requires quite fast processor, but even more important is to > have a network interface card that really supports the full speed of > gigabit ethernet line. The reason for that is that my test traffic > includes streams of very small packets that cause a lot of overhead in > processing. > > Most of my test traffic is UDP, but it does not really matter what the > higher layers of the traffic are, this scheme operates on the ethernet > layer and does not care about payload structure. > > I tried several NIC:s before i settled using Intel 82576 cards with the > igb driver. If you have less capable interface card, your small packet > performance is going to be a lot poorer. > > Using that card I can get to full speed GE line rate even with 64byte > packets, but if you want to send larger packets, say close to 1500byte > then almost any NIC will work OK for you. > > You can download the module code and the userland seeding application from > my svn server at https://toosa.swagman.org/svn/streamgen > The streamseed userland application requires libpcap-dev to build > correctly but the streamgen module is self-sufficent. > > There is not a lot of documentation, and the module is still "work in > progress" as I am going to fix it to work with more than one interface at > the same time when I get to do it. Currently it can only use one interface > on the sending host machine. Thanks for that. I am looking at pktgen. On UDP my system is able to send full bandwidth on 100Mbit/s ethernet and 220Mbit/s on 1G/s. I will let you know when I have any useful resutls. Thanks, Michal > > - Juice - > > >> Hi Juice, >> >> juice wrote: >>> Hi Michal. >>> >>> How fast do you need to send the data? >> It sounds weird but as fast as possible. There is no specific limit >> because I >> want to create demo and test it on various hw configuration which I can >> easily >> create on FPGA. For now the bottleneck is Microblaze cpu. It can run from >> 50MHz >> till 170-180MHz. We also support both endians and have two hw IP >> cores(10/100/1000) which I can use. >> >>> I have an application where I send test stream out to GE line and can >>> fill >>> the total capacity of the ethernet regardless of the packet size. >> What cpu do you use? >> >>> The test stream I am sending is stored in kernel memory, and therefore >>> is >>> limited by the amount of free memory. 200M is no problem. >> Is it UDP or TCP? >> >>> The solution I am using is loosely based on the pktgen module, except >>> that >>> my module can load a wireshark capture from userland program and then >>> send >>> it from ethernet interface in wire speed. >> Sound good. Would it be possible to see it and test it? >> >> Thanks, >> Michal >> >> >>> - Juice - >>> >>> >>>> Hi, >>>> I would like to create demo for high speed data sending from custom IP >>> through >>>> the ethernet. I think the best description is that there are dmaable >>>> memory >>>> mapped registers or just memory which store data I want to send (for >>> example 200MB). >>>> Linux should handle all communication between target(probably server) >>> and >>>> host >>>> (client) but data in the packets should go from that custom IP and >>>> can't go >>>> through the kernel because of performance issue. >>>> Ethernet core have own DMA which I could use but the question is if >>> there >>>> is any >>>> option how to convince the kernel that data will go directly from >>>> memory >>> mapped >>>> registers and the kernel/driver/... just setup dma BD for headers and >>> second for >>>> data. >>>> Do you have any experience with any solution with passing data >>> completely >>>> out of >>>> kernel? >>>> Thanks, >>>> Michal >>>> -- >>>> Michal Simek, Ing. (M.Eng) >>>> w: www.monstr.eu p: +42-0-721842854 >>>> Maintainer of Linux kernel 2.6 Microblaze Linux - >>>> http://www.monstr.eu/fdt/ >>>> Microblaze U-BOOT custodian >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe netdev" in >>>> the >>> body of a message to majordomo@...r.kernel.org >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>> >>> >> >> -- >> Michal Simek, Ing. (M.Eng) >> w: www.monstr.eu p: +42-0-721842854 >> Maintainer of Linux kernel 2.6 Microblaze Linux - >> http://www.monstr.eu/fdt/ >> Microblaze U-BOOT custodian >> > > -- Michal Simek, Ing. (M.Eng) w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/ Microblaze U-BOOT custodian -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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