>The z890 uses a separate CPU for all of the I/O's. Not just a separate CPU, but many separate cpu's. Each channel has what is basically a PowerPC RISC processor, similar to what is currently in the Macintosh PC, to handle all channel I/Os. My z800 has 112 of them. Plus the service processor, plus the processors in the control units, and so on.
An Intel-based PC running Windoze spends something like 80-85% of its time doing graphics and I/O processing. That's all from the main processor. The main processor on a z800 spends almost NO time doing I/O. It's offloaded in the form of a channel program to the other processors. All the main processor does is write the channel program, then forget about it and work on something else until the channel processor says it's done. If you include I/O processing in a 700mip 4-processor z800, the real total is something like 24,000mips, I've been told. But you have to have the right workload to exploit it. That's why my company has both mainframes AND Crays. Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. Gordon Wolfe, Ph. D. (425)865-5940 VM Technical Services, The Boeing Company > ---------- > From: Uriel Carrasquilla > Reply To: Linux on 390 Port > Sent: Thursday, June 30, 2005 10:33 AM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Business Week Article > > Chris: > The z890 uses a separate CPU for all of the I/O's. Something we don't have > on the aix/sun platform. > The application does lots of I/O to get the data and the server had tons of > cache which was of little value for our purposes. > We trimmed memory to just what was needed, mostly PGA plus 128 MB for the > OS plus a bonus 128 MB to feel good. > Now, instead of CPU cycles on my main processor managing large cache, the > work is shifted to the I/O CPU. > We run aix/sun at about 60% to keep customers happy. Now I can run busier > and we meet our requirements. > We are also running Apache, SMB and NFS. We collect a lot of data on a > daily basis and load into our dbms. > > Regards, > > [EMAIL PROTECTED] > NCCI > Boca Raton, Florida > 561.893.2415 > greetings / avec mes meilleures salutations / Cordialmente > mit freundlichen Grüßen / Med vänlig hälsning > > > > > "Little, Chris" > > <[EMAIL PROTECTED] To: > LINUX-390@VM.MARIST.EDU > hs.org> cc: > > Sent by: Linux on Subject: Re: Business Week > Article > 390 Port > > <[EMAIL PROTECTED] > > IST.EDU> > > > > > > 06/30/2005 01:16 > > PM > > > Please respond to > > Linux on 390 Port > > > > > > > > > > Were those Solaris/AIX servers underutilized? By a lot? > > Certainly workloads don't compare across platforms. I agree with that, but > for database workloads I was told (informally) to assume a single z/900 IFL > at a Pentium III 700mhz. Within reason, it seems correct. We are probably > getting better than that, but certainly nowhere near what you are seeing. > > Low CPU/high IO (webserving, maybe?) might translate better to linux on > zseries, I don't know. > > -----Original Message----- > From: Uriel Carrasquilla [mailto:[EMAIL PROTECTED] > Sent: Thursday, June 30, 2005 12:12 PM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Business Week Article > > Crhis: > I suspect not all workloads are the same. What we are finding out is that > loads are taking place much faster. That was a large pecentage of our > usage > before. We don't have any users signed on and we only run the zLinux image > to service requests. It works for us and no one is complaining. > > Regards, > > [EMAIL PROTECTED] > NCCI > Boca Raton, Florida > 561.893.2415 > greetings / avec mes meilleures salutations / Cordialmente mit freundlichen > Grüßen / Med vänlig hälsning > > > > > "Little, Chris" > > <[EMAIL PROTECTED] To: > LINUX-390@VM.MARIST.EDU > hs.org> cc: > > Sent by: Linux on Subject: Re: Business Week > Article > 390 Port > > <[EMAIL PROTECTED] > > IST.EDU> > > > > > > 06/30/2005 11:48 > > AM > > Please respond to > > Linux on 390 Port > > > > > > > > > > Are you getting that much performance out of an IFL? Four times the > performance of a single RISC unix server? > > I say that because the Oracle database we moved from an HP server with 2 > PA-RISC 8600 (440mhz) cpus consumed a little more than one IFL(100%-120% on > a two IFL LPAR). > > This was about in line with what IBM recommended. > > -----Original Message----- > From: Uriel Carrasquilla [mailto:[EMAIL PROTECTED] > Sent: Thursday, June 30, 2005 10:15 AM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Business Week Article > > John: > The formula we use is 4xCPU (sun 1.2 GHz or aix 1.0 GHz) is the same as one > IFL under z890 running zLinux under LPAR. > If zVM, we take away 10% power for the zVM overhead. > This is a rough estimate and gets refined upon the real circumstances. > Products licensing based on number of CPU's get penalized but we spend more > for the H/W (IBM is happy). > There are other benefits that are more important, such as saving in head > counts that I rather not get into but you can figure it out. > > Regards, > > [EMAIL PROTECTED] > NCCI > Boca Raton, Florida > 561.893.2415 > greetings / avec mes meilleures salutations / Cordialmente mit freundlichen > Grüßen / Med vänlig hälsning > > > > > "McKown, John" > > <[EMAIL PROTECTED] To: > LINUX-390@VM.MARIST.EDU > insctr.com> cc: > > Sent by: Linux on Subject: Re: Business Week > Article > 390 Port > > <[EMAIL PROTECTED] > > IST.EDU>> > > > > > > 06/30/2005 09:35 > > AM > > Please respond to > > Linux on 390 Port > > > > > > > > > > > -----Original Message----- > > From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of > > Pieter Harder > > Sent: Thursday, June 30, 2005 8:18 AM > > To: LINUX-390@VM.MARIST.EDU > > Subject: Re: Business Week Article > > > > > > > Run Oracle on the z/890 as a "super server", (We just eliminated > > > z/VM and Linux on the zSeries because nobody knew what to do with > > > them > > > > John, > > > > Just curious, on what are they planning to run Oracle then? > > zOS? You guys mus have gobs of money.... > > > > Best regards, > > Pieter Harder > > We don't have "gobs of money". That scenario is what is being touted by > certain managers. Personally, I don't buy it, but what do I know? They say > that Oracle is licensed by the number of processors in the box. And that a > license for z/OS on two processors (regardless of which processor it is - > z800, z890, z990, all the same cost) costs the same as a license for > Windows > running on two processors. This seems silly to me, but I cannot refute it. > > Also, at one time, we did test Oracle on Linux under z/VM (back when we had > those products). The Oracle DBAs (who ran the test themselves) came to the > conclusion that a z800 single IFL and 1 Gb of memory did not perform as > well > as a 10Gb Sun system with 10 processors. 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