Date: Sat, 02 Jun 2012 13:49:18 +0200 From: Florian Smeets <flo@FreeBSD.org> To: Ivan Voras <ivoras@FreeBSD.org> Cc: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, lev@FreeBSD.org, freebsd-hackers@FreeBSD.org Subject: Re: SuperPages utilization survey Message-ID: <4FC9FDBE.6080401@FreeBSD.org> In-Reply-To: <CAF-QHFUhOF=aW5Y2LRByH5wi%2BKsezMyrZuUL0w0AQCNweEGTaA@mail.gmail.com> References: <jqac8f$6mn$1@dough.gmane.org> <1073159468.20120602121458@serebryakov.spb.ru> <4FC9D420.6010203@FreeBSD.org> <alpine.BSF.2.00.1206021054120.40882@wojtek.tensor.gdynia.pl> <4FC9D68D.60405@FreeBSD.org> <alpine.BSF.2.00.1206021228320.43360@wojtek.tensor.gdynia.pl> <CAF-QHFUhOF=aW5Y2LRByH5wi%2BKsezMyrZuUL0w0AQCNweEGTaA@mail.gmail.com>
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On 02.06.12 12:48, Ivan Voras wrote:
> On 2 June 2012 12:29, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote:
>>>>
>>>
>>> In my words i would say "It enables mysql to use super-pages/large-pages".
>>
>> i asked the question wrong. the right should be "how does it do". Because i
>> am not aware about any user level interface in FreeBSD to explicitly request
>> superpage mapping.
>
> You are right, there isn't any.
>
> The code in mysqld.cc only works if HAVE_SOLARIS_LARGE_PAGES is defined:
>
> 3229 #endif /* HAVE_LARGE_PAGES */
> 3230 #ifdef HAVE_SOLARIS_LARGE_PAGES
> 3231 #define LARGE_PAGESIZE (4*1024*1024) /* 4MB */
> 3232 #define SUPER_LARGE_PAGESIZE (256*1024*1024) /* 256MB */
> 3233 if (opt_large_pages)
> 3234 {
>
> ...
>
> 3278 }
> 3279 #endif /* HAVE_SOLARIS_LARGE_PAGES */
>
As far as i understand it does at least enable usage of pages up to 4MB,
perhaps someone should teach mysql about the FreeBSD's limits?
If you look at the output i sent, it certainly changes from using no
superpage mappings at all to using them to some degree, if you script
can be trusted :)
Florian
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