- ixp1200 - lists.cs.princeton.edu

RE: [ixp1200] Doubt reg. Floating Point Operations support in IXP 1200
by David Mentre 09 Mar '04

09 Mar '04

Hello Romit, > From: romit dasgupta [mailto:romit@myrealbox.com] > Sent: Tuesday, March 09, 2004 10:04 AM > Thanks for your mail. Once I did a division > operation in the kernel and I got an error given by the assembler. I > enabled CONFIG_FPE_FASTFPE and the error vanished. Oh, I see. The CONFIG_FPE_FASTFPE option adds an handler on FP exception, so it also works within the kernel. I was wrong for that. > You are > right we are > not supposed to do FP operations in Kernel but my > understanding is that, > if we do really need FP operations in kernel we have to > explicitly save > the FP context. Correct me if I am wrong. I think you are right. However it might raise subtle bugs if you fail to save/restore the FP context at one scheduling point. > By the way, if we dont enable CONFIG_FPE_FASTFPE, cant we > still use libm > from userspace? I don't know. Yours, d. -- David Mentré <mentre(a)tcl.ite.mee.com> - Research engineer (Ph.D.) Mitsubishi Electric ITE-TCL / European Telecommunication Research Lab Phone: +33 2 23 45 58 29 / Fax: +33 2 23 45 58 59 http://www.mitsubishi-electric-itce.fr

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Doubt reg. Floating Point Operations support in IXP1200
by sharmila radhakrishnan 09 Mar '04

09 Mar '04

Hello All, I have a doubt.IXP1200 doesnot support floating point operations.Is their any way in which computations involving floating point operations can be done.I would be very much thankful if you'll could help me out with this.Thanx in advance. Regards, Sharmila Yahoo! India Insurance Special: Be informed on the best policies, services, tools and more.

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Time Is Running Out. IXA University Program IXP425 Student Design Competition
by Schuetze, Joel D 08 Mar '04

08 Mar '04

Greetings, Just a quick note to remind you that time is running out to get your entries submitted for the IXA University Program IXP425 Student Design Competition. Entries must be received by March 26th. The Intel IXA University Program Student Design competition will allow undergraduate and graduate university students from U.S. Universities to present innovative work based on the Intel(r) IXA architecture, specifically the IXP425 network processor. We have a web-based application process available through the IXAEDU.com website and all entries will be reviewed by an Intel panel of experts. The best qualified selected entries will be awarded grants and IXP425 development kits for the proposed projects. After the selected projects have been completed and submitted for judging, the top two (2) projects will be selected to receive an award presented at the Fall 2004 Intel Developer Forum (IDF). Please note that this competition is available for students enrolled at US Universities only. For complete information please visit http://ixaedu.com/news/DesignCompetition. IXA University Program Intel Corporation

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Reg TRIES
by dveluchamy＠vsnl.net 06 Mar '04

06 Mar '04

Hi all, Does Intel provide any library for working with tries? I find there is a mention of TRIE5 & TRIE8, but couldn't anything more in the docs. Thanx in advance. D.Veluchamy

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RE: [ixp1200] IXP1200 or IXF440 maximum MTU
by Botham, Mick 04 Mar '04

04 Mar '04

Tim, The IXF440 will process packets upto the size programmed into the 'Maximium Packet Size' register, although this accepts values upto 15 bits, you should limit this to Jumbo packet length. Rgds Mick -----Original Message----- From: ixp1200-bounces(a)lists.cs.princeton.edu [mailto:ixp1200-bounces@lists.cs.princeton.edu] On Behalf Of Tim Stevens Sent: 04 March 2004 15:27 To: ixp1200(a)lists.cs.princeton.edu Subject: [ixp1200] IXP1200 or IXF440 maximum MTU Hi, Can anyone tell me whether the IXP1200 boards (ours=ENP-2505) are capable of processing ethernet frames larger than 1500 bytes? Or is the IXF440 the limiting factor? I'm asking this because it might be practical to implement VLAN tagging 802.1Q (this adds 4 bytes to an ethernet frame) or other layer 2 features. Thanks. Kind regards, Tim _______________________________________________ ixp1200 mailing list ixp1200(a)lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/ixp1200

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IXP1200 or IXF440 maximum MTU
by Tim Stevens 04 Mar '04

04 Mar '04

Hi, Can anyone tell me whether the IXP1200 boards (ours=ENP-2505) are capable of processing ethernet frames larger than 1500 bytes? Or is the IXF440 the limiting factor? I'm asking this because it might be practical to implement VLAN tagging 802.1Q (this adds 4 bytes to an ethernet frame) or other layer 2 features. Thanks. Kind regards, Tim

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Execution Time Measurement in IXP1200 via gettimeofday
by Jo Ueyama 03 Mar '04

03 Mar '04

Hi All, I am trying to measure the execution time (via C/C++ gettimeofday) of applications running on the StrongARM but I am not being able to measure it properly. Basically, in 10/20% of the executions, gettimeofday is outputing time (in miliseconds) that is out of order (i.e. sometimes it outputs time lower than the previous one resulting in a negative time difference). Let me mention that the same code runs nicely on the PC. Has anyone ever come across such situation? How do you all normally measure execution time in the IXP1200 board? Thanks a lot in anticipation. Regards, -Jo'

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RE: [ixp1200] Receiving Data from a particular port on IXP2400
by David Mentre 01 Mar '04

01 Mar '04

Hello Sanjay, > From: Sanjay Kumar [mailto:ksanjay@cc.gatech.edu] > Sent: Friday, February 27, 2004 11:27 PM > I am writing a microengine rx/tx driver for ixp2400. for the > receive side, > i want to allocate a particular thread for particular MAC > port. > All I could find out was that MSF's receive status word (RSW) > contains a > field which tells which physical port this mpacket came from (e.g. in > POS-PHY Level 3, 32 bit MPHY mode, the 5 LSB bits of RSW0 > will tell this > information). and then it is the thread's job to read this > field and sort > out different mpackets received from different ports. This > will make the > driver pretty messy especially if you are employing multiple > threads to > receive mpackets from a particular port. >From my own reading of Intel docs, you can't wait on a given logical port, only for a physical port, for example in SPHY-4 mode. Why not reuse Intel design, i.e. one full micro-engine (8 threads) that receives from all ports? You could modify this block to output assembled network packets to different scratch ring if you want to have port differentiation. In my opinion (but I may be wrong), Intel engineers have optimized receive block for performance and it would be hard to do a better job. Sincerely yours, david -- David Mentré <mentre(a)tcl.ite.mee.com> - Research engineer (Ph.D.) Mitsubishi Electric ITE-TCL / European Telecommunication Research Lab Phone: +33 2 23 45 58 29 / Fax: +33 2 23 45 58 59 http://www.mitsubishi-electric-itce.fr

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Receiving Data from a particular port on IXP2400
by Sanjay Kumar 27 Feb '04

27 Feb '04

Hi Folks, I am writing a microengine rx/tx driver for ixp2400. for the receive side, i want to allocate a particular thread for particular MAC port. I want that, when I enqueue this thread into RX_THREAD_FREELIST, the thread should be able to specify in which port's mpacket data it is interested in, and the MSF should send a signal to the thread only when an mpacket from that particular port arrives. However, I have not been able to find out any way in which the thread can specify in which port's mpakcet it is interested. (i.e. the equivalent of 3 LSB bits of Receive Request (RCV_REQ) Register in IXP1200 IX bus interface). Is it possible to do that? If someone knows the answer, please let me know. All I could find out was that MSF's receive status word (RSW) contains a field which tells which physical port this mpacket came from (e.g. in POS-PHY Level 3, 32 bit MPHY mode, the 5 LSB bits of RSW0 will tell this information). and then it is the thread's job to read this field and sort out different mpackets received from different ports. This will make the driver pretty messy especially if you are employing multiple threads to receive mpackets from a particular port. Thanks in advance for any input. Sanjay -- ----------------------- http://www.cc.gatech.edu/~ksanjay

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RE: [ixp1200] quad_gbeth_2401
by David Mentre 24 Feb '04

24 Feb '04

Hello Liang, > From: Liang Jian [mailto:ixp2xxx@yahoo.com] > I use SDK quad_gbeth_2401 simulation mode have error, who used it > can you help me? The habit with such a mailing list is to present an issue or an information on the list, with all possible technical details available to you. After that, you'll see if one list reader can answer your question. If you want a personal help, ask your Intel representative or use Intel dedicated web sites (like premier.intel.com). Yours, david -- David Mentré <mentre(a)tcl.ite.mee.com> - Research engineer (Ph.D.) Mitsubishi Electric ITE-TCL / European Telecommunication Research Lab Phone: +33 2 23 45 58 29 / Fax: +33 2 23 45 58 59 http://www.mitsubishi-electric-itce.fr

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