Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750779AbWEDSmR (ORCPT ); Thu, 4 May 2006 14:42:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751513AbWEDSmR (ORCPT ); Thu, 4 May 2006 14:42:17 -0400 Received: from bay105-f16.bay105.hotmail.com ([65.54.224.26]:27035 "EHLO hotmail.com") by vger.kernel.org with ESMTP id S1750779AbWEDSmR (ORCPT ); Thu, 4 May 2006 14:42:17 -0400 Message-ID: X-Originating-IP: [84.81.201.82] X-Originating-Email: [rwm_rietveld@hotmail.com] In-Reply-To: From: "Roy Rietveld" To: linux-os@analogic.com Cc: linux-kernel@vger.kernel.org, jengelh@linux01.gwdg.de Subject: Re: TCP/IP send, sendfile, RAW Date: Thu, 04 May 2006 18:42:16 +0000 Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed X-OriginalArrivalTime: 04 May 2006 18:42:16.0735 (UTC) FILETIME=[778ADAF0:01C66FAA] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4793 Lines: 136 i tried but it doesn't help, still 40MBits. Does send or sento cost a lot of cpu load. i tried to measure the cpu time sendto cost. gettimeofday(start) sendto gettimeofday(end) print end - start time measured is 250 us. >From: "linux-os (Dick Johnson)" >Reply-To: "linux-os (Dick Johnson)" >To: "Roy Rietveld" >CC: , >Subject: Re: TCP/IP send, sendfile, RAW >Date: Thu, 4 May 2006 14:27:47 -0400 > > >On Thu, 4 May 2006, Roy Rietveld wrote: > > > Yes it is 100 MBits and there is a listener. and there are no other pc's >on > > the link because its cross cable link. And when sending large buffers > > 32Kbyte it will do 80 MBits. It think that there is a lot of overhead in >the > > fucntion send or something. > > > >Use sendto() and recvfrom() for UDP. Stream protocols require an ACK and >are slower. > > > > >> From: "linux-os (Dick Johnson)" > >> Reply-To: "linux-os (Dick Johnson)" > >> To: "Jan Engelhardt" > >> CC: "Roy Rietveld" > >> , > >> Subject: Re: TCP/IP send, sendfile, RAW > >> Date: Thu, 4 May 2006 13:56:31 -0400 > >> > >> > >> On Thu, 4 May 2006, Jan Engelhardt wrote: > >> > >>>> I would like to send ethernet packets with 1400 bytes payload. > >>>> I wrote a small program witch sends a buffer of 1400 bytes in a >endless > >> loop. > >>>> The problem is that a would like 100Mbits throughtput but when i >check > >> this > >>>> with ethereal. > >>>> I only get 40 MBits. I tried sending with an UDP socket and RAW >socket. > >> I also > >>>> tried sendfile. > >>>> The RAW socket gives the best result till now 50 MBits throughtput. > >>> > >>> Limitation of Ethernet. > >>> > >>> > >>> > >>> Jan Engelhardt > >> > >> Maybe he can tell what he means by 100 MBits! If he is looking for > >> 100 megabits per second, that's easy, That's 100/8 = 12.5 megabytes > >> per second. Anything, including Windows on a wet string, will > >> do that. If he is looking for 100 megabytes per second, that's > >> hard. He would need 100 * 8 = 800 megabits/second. A "gigabit" link > >> runs that fast if nobody else is on it, but there is a header and CRC > >> tail, in addition to the payload. UDP is the protocol to use to realize > >> this kind of bandwidth, but its possible for some packets to get lost >and, > >> if they are routed, they could even be duplicated. Also, when testing > >> UDP, there must be a listener in order to realize the high speed. > >> You can't just spew out a dead-end link. > >> > >> Cheers, > >> Dick Johnson > >> Penguin : Linux version 2.6.16.4 on an i686 machine (5592.89 BogoMips). > >> New book: http://www.lymanschool.com > >> _ > >>  > >> > >> **************************************************************** > >> The information transmitted in this message is confidential and may be > >> privileged. Any review, retransmission, dissemination, or other use of > >> this information by persons or entities other than the intended >recipient > >> is prohibited. If you are not the intended recipient, please notify > >> Analogic Corporation immediately - by replying to this message or by > >> sending an email to DeliveryErrors@analogic.com - and destroy all >copies of > >> this information, including any attachments, without reading or >disclosing > >> them. > >> > >> Thank you. > >> - > >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" >in > >> the body of a message to majordomo@vger.kernel.org > >> More majordomo info at http://vger.kernel.org/majordomo-info.html > >> Please read the FAQ at http://www.tux.org/lkml/ > > > > > > > >Cheers, >Dick Johnson >Penguin : Linux version 2.6.16.4 on an i686 machine (5592.89 BogoMips). >New book: http://www.lymanschool.com >_ > > >**************************************************************** >The information transmitted in this message is confidential and may be >privileged. Any review, retransmission, dissemination, or other use of >this information by persons or entities other than the intended recipient >is prohibited. If you are not the intended recipient, please notify >Analogic Corporation immediately - by replying to this message or by >sending an email to DeliveryErrors@analogic.com - and destroy all copies of >this information, including any attachments, without reading or disclosing >them. > >Thank you. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/