Date: Tue, 23 Apr 2024 15:29:10 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Alan Somers <asomers@freebsd.org> Cc: Karl Denninger <karl@denninger.net>, freebsd-hackers@freebsd.org Subject: Re: Stressing malloc(9) Message-ID: <5abe7eb5b80ab164b91c858bfd8121d7@Leidinger.net> In-Reply-To: <CAOtMX2jnNvnZBe7UdktQggsEQO%2BfovA-g_=-fZtbhH=caSLksQ@mail.gmail.com> References: <CAOtMX2jeDHS15bGgzD89AOAd1SzS_=FikorkCdv9-eAxCZ2P5w@mail.gmail.com> <ZiPaFw0q17RGE7cS@nuc> <CAOtMX2jk6%2BSvqMP7Cbmdk0KQCFZ34yWuir7n_8ewZYJF2MwPSg@mail.gmail.com> <ZiU6IZ29syVsg61p@nuc> <CAOtMX2j=yaYeE%2B-fycg2mRRC_Jb9p74cn_dcenhH2xRRxz1shg@mail.gmail.com> <CAOtMX2hDfX-T90x9Fb2Wh%2BvgLvw9fUGmaDxh-FWaYwBTPwFY6Q@mail.gmail.com> <b1e56d20-dc98-4fff-adec-3f8cfae26c05@denninger.net> <CAOtMX2irXo_hvrhQhw0eLjCBiH7hZMTR9notBn9aDEMTynQiuQ@mail.gmail.com> <2b72c4f749e93dfec08a164d5a664ee3@Leidinger.net> <CAOtMX2jnNvnZBe7UdktQggsEQO%2BfovA-g_=-fZtbhH=caSLksQ@mail.gmail.com>
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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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