mckay@burdvax.UUCP (03/26/85)
We here at burdvax are about to install an interleaved memory system on a VAX 11/780 running Berkeley 4.2 and have had a couple of lively discussions about the performance value of interleaved memory. We have a somewhat largish configuration: a) 1 Unibus with 2 CDC9766's off of an Emulex SC21V controller, an 8 line DZ connected to a Rascal-Vadic modem rack, 64 tty ports on an Emulex CS21 emulating 4 DH's, an Interlan 10MB Ethernet controller, 2 Versatecs, a Printronix interfaced thru an LP11 and a Cipher 800/1600bpi tape drive off of a TU11 controller; b) an RM03 disk on a Massbus; c) 4 CDC9766's off of an Emulex SC780 (a second Massbus). I was wondering whether there is any experimental data or rational consensus out in netland about this performance issue. Also, does anyone run 4.2 without interleaved memory? Finally, do some of the Berkeley Unix subsystems, eg "Fast file system", expect to be running on systems with interleaved memory? What I am thinking of here is the disk block sizes, eg 8K blocks (1/2 track) vs 4KB blocks (1/4 track), seem fairly large for a system with a single memory controller. Any info, including references on this topic would be appreciated. Please begin discussion by mailing to me and I will summarize. Thanks in advance. Don McKay ...sdcrdcf!burdvax!mckay ...psuvax1!burdvax!mckay Research & Development System Development Corporation Paoli, PA