iperf performance for TCP is line rate in both directions using 3 threads However, I can just get 700MB/s Write and 570MB/s Reads with iSCSI.
Thanks for any pointers! On Tuesday, August 26, 2014 1:11:59 PM UTC-7, learner.study wrote: > > Another related observation and some questions; > > I am using open iscsi on init with IET on trgt over a single 10gbps link > > There are three ip aliases on each side > > I have 3 ramdisks exported by IET to init > > I do iscsi login 3 times, once using each underlying ip address and > notice that each iscsi session sees all 3 disks. > > Is it possible to restrict such that each init only sees one separate > disk? > > When I run fio on each mounted disk, I see that only two underlying tcp > sessions are being used - that limits the perf. > Any ideas on how to overcome this? > > Thanks! > > > Sent from my iPhone > > On Aug 26, 2014, at 12:53 PM, "Mark Lehrer" <m...@knm.org> wrote: > > > On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr <al...@iplink.net> wrote: > >> > >>>> I am trying to achieve10Gbps in my single initiator/single target > >>>> env. (open-iscsi and IET) > >>> > >>> On a semi-related note, are there any good guides out there to > >>> tuning Linux for maximum single-socket performance? On my 40 gigabit > >> > >> You are likely getting hit by the bandwidth-delay product. > >> Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product > >> and http://www.kehlet.cx/articles/99.html > > > > Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. > Unfortunately that is still only about 10% of the available bandwidth. > > > > I'll keep on tweaking and see how far I can take it. > > > > Thanks, > > Mark > > > > -- > > You received this message because you are subscribed to the Google > Groups "open-iscsi" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to open-iscsi+unsubscr...@googlegroups.com. > > To post to this group, send email to open-iscsi@googlegroups.com. > > Visit this group at http://groups.google.com/group/open-iscsi. > > For more options, visit https://groups.google.com/d/optout. > On Tuesday, August 26, 2014 1:11:59 PM UTC-7, learner.study wrote: > > Another related observation and some questions; > > I am using open iscsi on init with IET on trgt over a single 10gbps link > > There are three ip aliases on each side > > I have 3 ramdisks exported by IET to init > > I do iscsi login 3 times, once using each underlying ip address and > notice that each iscsi session sees all 3 disks. > > Is it possible to restrict such that each init only sees one separate > disk? > > When I run fio on each mounted disk, I see that only two underlying tcp > sessions are being used - that limits the perf. > Any ideas on how to overcome this? > > Thanks! > > > Sent from my iPhone > > On Aug 26, 2014, at 12:53 PM, "Mark Lehrer" <m...@knm.org> wrote: > > > On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr <al...@iplink.net> wrote: > >> > >>>> I am trying to achieve10Gbps in my single initiator/single target > >>>> env. (open-iscsi and IET) > >>> > >>> On a semi-related note, are there any good guides out there to > >>> tuning Linux for maximum single-socket performance? On my 40 gigabit > >> > >> You are likely getting hit by the bandwidth-delay product. > >> Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product > >> and http://www.kehlet.cx/articles/99.html > > > > Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. > Unfortunately that is still only about 10% of the available bandwidth. > > > > I'll keep on tweaking and see how far I can take it. > > > > Thanks, > > Mark > > > > -- > > You received this message because you are subscribed to the Google > Groups "open-iscsi" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to open-iscsi+unsubscr...@googlegroups.com. > > To post to this group, send email to open-iscsi@googlegroups.com. > > Visit this group at http://groups.google.com/group/open-iscsi. > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
