install guide draft

[Mani A]

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On Fri, Apr 3, 2009 at 9:30 PM,  <fedora-docs-list-request at redhat.com> wrote:
Ruediger Landmann <r.landmann at redhat.com> wrote:
>
> Mani A wrote:
>> I had a look at some parts of
>>
>> http://rlandmann.fedorapeople.org/Installation Guide/en-US/html
>>
> Many thanks! We need eyes on this.
>> "7.22.4. SMP Motherboards and GRUB
>> In previous versions of Fedora there were two different kernel
>> versions, a uniprocessor version and an SMP version. In Fedora 11 the
>> kernel is SMP-enabled by default and will take advantage of multiple
>> core, hyperthreading, and multiple CPU capabilities when they are
>> present. This same kernel can run on single CPUs with a single core
>> and no hyperthreading. "
>>
>>
>> This is being repeated since FC-4-6?
>>
> Did the native kernel have multiprocessor support before F9?
> http://docs.fedoraproject.org/release-notes/f9/en_US/sn-Kernel.html
> (whatever version it was, the text should be clarified to name it
> specifically)

http://docs.fedoraproject.org/release-notes/fc6/en_US/sn-Kernel.html#id2840748

mentions it

http://docs.fedoraproject.org/release-notes/fc5/release-notes-ISO/#id3131236

says 'There is no separate SMP kernel available for the x86_64
architecture in Fedora Core 5'


> This note will become less and less relevant with each release – at what
> point should we drop it though?

I think it is time.  Very few distros have been having different
kernels for SMP and uniprocessors for 2+ years.

>> "Swap should equal 2x physical RAM for up to 2 GB of physical RAM, and
>> then an additional 1x physical RAM for any amount above 2 GB, but
>> never less than 32 MB.
>> So, if:
>> M = Amount of RAM in GB, and S = Amount of swap in GB, then
>>
>> If M < 2
>>       S = M *2
>> Else
>>       S = M + 2"
>>
>> Using this formula, a system with 2 GB of physical RAM would have 4 GB
>> of swap, while one with 3 GB of physical RAM would have 5 GB of swap.
>> Creating a large swap space partition can be especially helpful if you
>> plan to upgrade your RAM at a later time.
>> For systems with really large amounts of RAM (more than 32 GB) you can
>> likely get away with a smaller swap partition (around 1x, or less, of
>> physical RAM)."
>>
>>
>> The formula is not correct. Or is this the result of some special study?
>>
> The formula is the current recommendation in Red Hat Enterprise Linux
> (see http://kbase.redhat.com/faq/docs/DOC-15252 ) and is what anaconda
> will create by default when installing Red Hat Enterprise Linux or
> Fedora. I don't think we should change this recommendation unless
> anaconda's behaviour changes as well.
>
> I think the text makes it pretty clear that this recommendation is only
> indicative; it's prefaced "If you are unsure about what size swap
> partition to create..."
>
> Do you think we need to draw more attention to this being a "rule of thumb"?


Some references should be provided.

On systems with SSDs swap partitions are not recommended.
__________________________


Kernel Options

Most if not all desktop, netbook and laptop users will need the option
iommu=noaperture

It should be documented.

btw some parts of the draft guide have explicit instructions for RHEL

Best

A. Mani

- --
A. Mani
Member, Cal. Math. Soc

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