Date: Tue, 30 Apr 2019 02:56:20 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Wojciech Puchar <wojtek@puchar.net> Cc: freebsd-hackers@freebsd.org Subject: Re: very low performance tcp/rsh Message-ID: <cb76aa41-1472-5df1-5b24-384f6453f3de@grosbein.net> In-Reply-To: <alpine.BSF.2.20.1904292111080.57162@puchar.net> References: <alpine.BSF.2.20.1904292028400.48623@puchar.net> <ef440d5f-c543-148a-4e68-44b0bc62b28f@grosbein.net> <alpine.BSF.2.20.1904292111080.57162@puchar.net>
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30.04.2019 2:22, Wojciech Puchar wrote: > create 32GB hole-file > > dd if=/dev/zero of=test bs=32k seek=1m count=0 > > fetch -o /dev/null over ftp (proftpd) gives 1.4GB/s > > proftpd consumed 100% of single core. much better. > > tested with FreeBSD ftpd - 1.7GB/s > > seems like freebsd can saturate 10Gb/s ethernet with single core (Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz) > > > Still where is the most overhead? one memcopy to packet buffers+creating packet headers (send). > > reception is on separate process taking another core. > > > still - quite good. But compared to filesystem overhead - large. Do not use file with holes (holes require special processing taking lots of CPU cycles). Create ordinary file within RAM disk and use sock ftp daemon for sake of sendfile().
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