Date: Mon, 04 Feb 2008 11:54:54 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Stefan Lambrev <stefan.lambrev@moneybookers.com> Cc: freebsd-hackers@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: gettimeofday() in hping Message-ID: <47A6EEFE.8040809@FreeBSD.org> In-Reply-To: <47A6EA28.6000902@moneybookers.com> References: <4795CC13.7080601@moneybookers.com> <4795FE54.9090606@moneybookers.com> <86lk6i0vzk.fsf@ds4.des.no> <479605E2.6070709@moneybookers.com> <fn5c7u$i7e$2@ger.gmane.org> <47964356.6030602@moneybookers.com> <479647FB.3070909@FreeBSD.org> <47970EE2.5000400@moneybookers.com> <fn7evj$smv$1@ger.gmane.org> <479754E6.1060101@moneybookers.com> <9bbcef730801230802n5c52832bk60c6afc47be578f4@mail.gmail.com> <47976AD4.3020203@moneybookers.com> <47A62EE8.2000700@FreeBSD.org> <47A62F1D.8070507@FreeBSD.org> <47A639B5.2020909@FreeBSD.org> <47A6EA28.6000902@moneybookers.com>
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Stefan Lambrev wrote: > Greetings, > > Kris Kennaway wrote: >> Kris Kennaway wrote: >> >>>> Fixing all of the above I can send at about 13MB/sec (timecounter is >>>> not relevant any more). The CPU is spending about 75% of the time >>>> in the kernel, so >>> that is the next place to look. [hit send too soon] >> >> Actually 15MB/sec once I disable all kernel debugging. This is >> identical to Linux 2.6.24 on the same hardware. The patch I use to >> fix hping brain-damage is attached. >> >> Kris > Indeed this patch highly improve results (x2) under FreeBSD. On my > hardware the max speeds under FreeBSD i still little slower compared to > Linux (something like 19 vs 19.5 MB/s) > but the speed is quite more stable under FreeBSD (under linux the > average speed seems slower) > > I didn't tested the patch under linux but will do soon. > Thanks for the help :) > > BTW 262144 is little high as this match the default value in FreeBSD, I > tested with twice smaller buffer and do not see performance lost. > Kris if you do not mind I'll write to hping developers to adopt this > patch, and if no response from them I can try to reach the port > maintainer, so we have this patched in ports? > My patch is a bit crude, because I didnt have the courage to digest the entire structure of the code, so it may be slightly wrong with respect to other operating modes (the #if 0 part is wrong, but that code needs to be rewritten). Some version of it should be included in the software, but perhaps after renaming the patch file ;-) Kris
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