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- From: dgogates@fberry ()
- Subject: Re: /usr performance for 220's
- Sender: news@austin.ibm.com (News id)
- Message-ID: <Bzrn3L.Jt2@austin.ibm.com>
- Date: Thu, 24 Dec 1992 13:35:45 GMT
- References: <1992Dec22.221251.28368@cc.gatech.edu> <Bzox55.JMH@cantua.canterbury.ac.nz>
- Organization: IBM, Austin
- Lines: 29
-
- In article <Bzox55.JMH@cantua.canterbury.ac.nz> davis@chem.canterbury.ac.nz writes:
- >Mike JD Espig (jd@cc.gatech.edu) wrote:
- >> I just finished installing a new IBM 220 as a /usr client. The only
- >> problem is that the performance is terrible! I remember a thread about
- >> this recently and was wondering if any solutions were posted.
- >
- >I've found that the default size transmit and receive queues pretty
- >much throttles NFS performance (like 50K/s max read rate). Upping them
- >to their max (default is 30 for both, max is 150 ) helps a lot - doing
- >that we got more like 500K/s max read speed, but write speed is still
- >a very low 150K/s. What's odd is that this _wasn't_ happening
- >under 3.1.6, we had the default size queues and we were getting
- >MUCH higher throughput ( 800K/s on read, 600K/s on writes).
- >
- >me thinks something is broken....
-
- The rs/6000 model 220 has the integrated ethernet built into it, so
- you will need to get PTF U410209 to fix some ethernet performance
- problems. Bumping up the xmit queue sizes to 150 is too much, we have
- found that around 45 gives optimal NFS performance.
-
- Also, since this is a /usr client, after the PTF is installed you
- will need to do the bosboot command to re-build to boot image
- for the 220.
-
- --
- Dale Gogates | ..taliesin!gowright!dgogates
- Views expressed are MINE | ..dogface!hitex!gowright!dgogates
- | @ibmpa.awdpa.ibm.com:dgogates%byu.austin.ibm.com
-