Re: Stressing malloc(9)

Am 2024-04-23 14:47, schrieb Alan Somers:
> On Tue, Apr 23, 2024 at 2:37 AM Alexander Leidinger
> <Alexander@leidinger.net> wrote:

>> You basically say, that it is not uncommon to have such large
>> allocations with kernels we ship (even in releases).
>> Wouldn't it make sense to optimize the kernel to handle larger uma
>> allocations?
>> 
>> Or do you expect it to be specific to ZFS and it may be more sane to
>> discuss with the OpenZFS developers to reduce this default setting?
> 
> Yes, both of those things are true.  It might make sense to reduce the
> setting's default value.  OTOH, the current value is probably fine for
> people who don't use geli (and possibly other transforms that require
> allocating data).  And it would also be good to optimize the kernel to
> perform these allocations more efficiently.  My best idea is to teach
> g_eli_alloc_data how to allocate scatter/gather lists of 64k buffers
> instead of contiguous memory.  The memory doesn't need to be
> contiguous, after all.  But that's a bigger change, and I don't know
> that I have the time for it right now.
> -Alan

Do you have time do make a nice description of what would have to be 
done in the wiki?
     https://wiki.freebsd.org/IdeasPage

Bye,
Alexander.

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