Thanks to: Kevin Buterbaugh <Kevin.Buterbaugh@lifeway.com> Tony Walsh-Field Service Engineer"<Tony.Walsh@Sun.COM> system administration account" <sysadmin@astro.su.se> "Scott Howard" <scott@doc.net.au> "Bob Rahe" <bob@dtcc.edu> Almost everyone thinks that memory interleave works in the "power of two" fashion. As Tony Walsh put it: Memory interleave happens on banks in 'powers of 2' counts. In other words, 1, 2, 4, or 8 banks are put together to make an interleaved bank. So what you have is the correct layout. You would need another CPU/memory board to change the pattern. Kevin Buterbaugh offered a different perspective: I don't think you will. I've got an almost identical situation with a E3000. I'm getting a combination of 4-way and 2-way interleaving. I can't find anything on SunSolve to indicate that 6-way interleaving is possible(it refers to powers of 2). However, in "System Performance Tuning, 2nd edition" by Gian-Paolo D. Musumeci and Mike Loukides, Gian-Paolo (a Sun engineer, BTW) says that the Ultra Enterprise line will do 6-way interleaving. I've e-mailed him about that, but haven't heard back from him yet. If you find out that it is possible, I'd like to know how it's done... Yet another feedback from sysadmin@astro.su.se: It looks like the interleave must be a power of two (1-way, 2-way, 4-way or 8-way). I got a failed DIMM in a SunFire 6800 today, and that broke the usual 8-way interleaving into a mix of 4-, 2- and 1-way. One would have hoped for a 6-way, but no. I can't give you a rationale for this design, but it seems to apply to a number of Sun's midrange servers. (Actually, on second thought it seems to me that 6-way interleaves would require slightly more elaborate logic in the MMU, since you can't just shuffle address bits any more but must do either a table lookup or a calculation. Maybe that's the reason.) ---- Original question: I have an E4500 with 3 CPU/Memory boards, each populated with identical memory SIMMS and CPU modules (each SIMM is 256 MB, each bank = 2GB) CPU are all 400Mhz modules with 8 MB Ecache. Question: Should I get 6-way interleave memory for this configuration ( 6 memory banks) Here is what I get when I run "prtdiag" command: (I got a mixture of 4 way and 2 way interleave) Please reply. I will summarize Tony ---- output of "prtdiag -v" : System Configuration: Sun Microsystems sun4u 8-slot Sun Enterprise E4500/E5500 System clock frequency: 100 MHz Memory size: 12288Mb ========================= CPUs ========================= Run Ecache CPU CPU Brd CPU Module MHz MB Impl. Mask --- --- ------- ----- ------ ------ ---- 0 0 0 400 8.0 US-II 10.0 0 1 1 400 8.0 US-II 10.0 2 4 0 400 8.0 US-II 10.0 2 5 1 400 8.0 US-II 10.0 4 8 0 400 8.0 US-II 10.0 4 9 1 400 8.0 US-II 10.0 ========================= Memory ========================= Intrlv. Intrlv. Brd Bank MB Status Condition Speed Factor With --- ----- ---- ------- ---------- ----- ------- ------- 0 0 2048 Active OK 60ns 4-way A 0 1 2048 Active OK 60ns 4-way A 2 0 2048 Active OK 60ns 4-way A 2 1 2048 Active OK 60ns 2-way B 4 0 2048 Active OK 60ns 4-way A 4 1 2048 Active OK 60ns 2-way B ========================= IO Cards ========================= Bus Freq Brd Type MHz Slot Name ====================== Most recent AC Power Failure: ============================= Wed May 15 10:40:41 2002 ========================= Environmental Status ========================= Keyswitch position is in Normal Mode System Power Status: Redundant System LED Status: GREEN YELLOW GREEN Normal ON OFF BLINKING Fans: ----- Unit Status ---- ------ Rack OK Key OK AC OK System Temperatures (Celsius): ------------------------------ Brd State Current Min Max Trend --- ------- ------- --- --- ----- 0 OK 30 27 34 stable 1 OK 37 36 37 stable 2 OK 29 25 32 stable 3 OK 39 38 41 stable 4 OK 27 23 30 stable 5 OK 34 32 35 stable 7 OK 39 39 41 stable CLK OK 27 26 28 stable Power Supplies: --------------- Supply Status --------- ------ 0 OK 1 OK 2 OK 3 OK PPS OK System 3.3v OK System 5.0v OK Peripheral 5.0v OK Peripheral 12v OK Auxilary 5.0v OK Peripheral 5.0v precharge OK Peripheral 12v precharge OK System 3.3v precharge OK System 5.0v precharge OK AC Power OK ========================= HW Revisions ========================= ASIC Revisions: --------------- Brd FHC AC SBus0 SBus1 PCI0 PCI1 FEPS Board Type Attributes --- --- -- ----- ----- ---- ---- ---- ---------- ---------- 0 1 5 CPU 100MHz Capable 1 1 5 1 1 22 Dual-SBus-SOC+ 100MHz Capable 2 1 5 CPU 100MHz Capable 3 1 5 1 1 22 Dual-SBus-SOC+ 100MHz Capable 4 1 5 CPU 100MHz Capable 5 1 5 1 1 22 Dual-SBus-SOC+ 100MHz Capable 7 1 5 4 4 c1 Dual-PCI 100MHz Capable System Board PROM revisions: ---------------------------- Board 0: OBP 3.2.29 2001/06/18 17:28 POST 3.9.29 2001/06/18 17:50 Board 1: FCODE 1.8.29 2001/06/18 17:26 iPOST 3.4.29 2001/06/18 17:49 Board 2: OBP 3.2.29 2001/06/18 17:28 POST 3.9.29 2001/06/18 17:50 Board 3: FCODE 1.8.29 2001/06/18 17:26 iPOST 3.4.29 2001/06/18 17:49 Board 4: OBP 3.2.29 2001/06/18 17:28 POST 3.9.29 2001/06/18 17:50 Board 5: FCODE 1.8.29 2001/06/18 17:26 iPOST 3.4.29 2001/06/18 17:49 Board 7: FCODE 1.8.29 2001/06/18 17:25 iPOST 3.0.29 2001/06/18 17:49 Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Tue Jul 16 02:36:18 2002
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