Date: Tue, 15 Jul 2014 07:37:30 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: UDP/TCP versus IP frames - subtle out of order packets with hardware hashing Message-ID: <CAJ-Vmo=gSaJ5_VGEuprfdVnMiwWFJqe=B0x5zfdGdhYndEwH8w@mail.gmail.com> In-Reply-To: <20140715143635.GA5178@zxy.spb.ru> References: <CAJ-VmomUNJ23CHLLX2qryAuE2XQyBmo30du3MuRnobs%2BwEkguA@mail.gmail.com> <53C4EE00.5090705@gmail.com> <20140715093125.GA89128@zxy.spb.ru> <53C507F2.2090604@gmail.com> <20140715113319.GA96254@zxy.spb.ru> <CAJ-VmomTL=fZnjSTBT6-3KNA0DOqNEefoXNwFipade81dSBK5Q@mail.gmail.com> <20140715143635.GA5178@zxy.spb.ru>
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On 15 July 2014 07:36, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote: > On Tue, Jul 15, 2014 at 07:33:57AM -0700, Adrian Chadd wrote: > >> On 15 July 2014 04:33, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote: >> > On Tue, Jul 15, 2014 at 03:22:34PM +0430, Hooman Fazaeli wrote: >> > >> >> On 7/15/2014 2:01 PM, Slawa Olhovchenkov wrote: >> >> > On Tue, Jul 15, 2014 at 01:31:52PM +0430, Hooman Fazaeli wrote: >> >> > >> >> >> Doesn't the problem applies to TCP too? >> >> >> TCP may be fragmented too but is less likely because of MSS. >> >> > Don't forget GRE, IPIP, ESP and AH! >> >> > >> >> These protocols don't use port numbers and the RSS hash is computed based on the >> >> (srcip,dstip) tuple, so the problem does not apply to them. >> > >> > And all flows go to one queue? Bad. >> >> All the packets between two IP addresses for non-TCP, non-UDP get >> hashed to the same CPU core, yes. >> >> If you have 1000 IP tunnels to different end-hosts, they'll be on >> different CPUs. > > What about two host, 10G link and 1000 TCP connections over IPsec? > _______________________________________________ > freebsd-arch@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"
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