At least on x86, there's also a benefit in having smaller page tables.
In particular, it makes the job of the TLB a lot easier for large memory
systems.

On 03/12/2015 03:59 AM, Steven Harris wrote:
> Hi Andrew
>
> The original reasoning on AIX was that as the data is transferred to
> tape AIX gets a spin lock on each 4k page and then has to release it,
> so that a system using tape heavily spends quite a lot of CPU
> acquiring and releasing locks.
>
> Later versions of AIX have two larger page sizes available and so the
> number of locks to be taken and released drops dramatically for the
> typical 256KB tape transfer.
>
> I'm not sure whether this reasoning applies to Linux.  If it does then
> a larger page size might be beneficial there.
>
> Regards
>
> Steve
>
> Steven Harris
> TSM Admin
> Canberra Australia.
>
> On 12/03/2015 3:20 AM, Andrew Galloway wrote:
>> We have 2 TSM 6.3.5 servers running on zLinux.  Is this something
>> we could leverage?
>>
>>
>>
>>
>>
>> __________________________ Andrew Galloway Operational Systems
>> Continuity Analyst SSC RCMP Technology Directorate CIO Building
>> C1035 R.C.M.P. Headquarters 1200 Vanier Parkway Ottawa ON K1A 0R2
>> 613.998.7707
>> andrew.galloway AT ssc-spc DOT gc.ca__________________________
>>>>> "Rhodes, Richard L." <rrhodes AT FIRSTENERGYCORP DOT COM> 2015-03-11
>>>>> 7:15 AM >>>
>> I've been in meetings/training this week about AIX LPM and other
>> stuff related with LPARS.  We got talking about our TSM servers,
>> and the IBM leader mentioned a presentation given a while ago at a
>> IBM conference about using LARGE PAGES (16MB) with TSM to prevent
>> lock contention.  This is supposed to help if you drive some large
>> number of tape drives concurrently. He mentioned one company that
>> implemented this and saw a 20% increase in tape throughput.
>>
>> http://www-01.ibm.com/support/docview.wss?uid=swg21649823&aid=1
>>
>> I'm curious if anyone out there has heard of this and possibly
>> implemented large pages for TSM.
>>
>> Thanks!
>>
>> Rick
>>
>>
>>
>>
>>
>>
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