Taking Sun/Solaris out of the equasion:

My snapmirror between a F760 and F840 with gigabit interfaces is running at about 300Mb/s with MTU size 9000 and flowcontrol set to none. Without jumbo frames I was seeing throughput of about 200Mb/s.

James S. Hudson

UNIX Systems Administrator Pfizer Global Research and Development, La Jolla Laboratories 11095 Torreyana Road San Diego CA 92121 858.622.7665

-----Original Message----- From: Hsueh-Mei Tsai(May Tsai) [mailto:may-tsai@ti.com] Sent: Tuesday, January 22, 2002 11:38 AM To: toasters@mathworks.com Subject: Re: Gigabit ethernet performance

Thanks for all the replies.

Some background info: Sun client is a 420R running Solaris7, NetApp is F820 running 6.1.1R2. Both are PCI cards. I've checked the NOW sites and tried to change various Sun parameters with no significant differences.

Local disk creation takes 35 secs(single drive) vs. NetApp's 7 data/1 parity volume, which produces ~30secs results. Direct tmpfs writes takes 8 secs. Aggregated results in 27.5 seconds, still not much better though.

The NetApp support engineer I worked with mentioned it's back-to-back CP bottleneck, that's not on the network side, correct? Does that mean the Netapp F820 can't handle consistent huge data flows? As to Jumbo frame, I haven't tried it yet, the Gbit switch I use probably won't support it, well. Does it adds a lot to the performance?

May