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help / color / mirror / Atom feedFrom: Andreas Karlsson <[email protected]>
To: Jakub Wartak <[email protected]>
To: Steven Niu <[email protected]>
Cc: Pierre <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [PATCH] check kernel version for io_method
Date: Wed, 14 Jan 2026 18:26:27 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKZiRmy3xrsju81b-fzUjtwn_dHR-744eJ31KYzo8hiyGnxMBA@mail.gmail.com>
References: <[email protected]>
<[email protected]>
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<CAKZiRmy3xrsju81b-fzUjtwn_dHR-744eJ31KYzo8hiyGnxMBA@mail.gmail.com>
On 1/14/26 12:14 PM, Jakub Wartak wrote:
> I haven't looked at this patch, however the above statement is not
> completely true. There is a parallel problem [1] related to kernel
> version, where if you do not run proper kernel version (>= 6.5) or
> proper liburing version, then fork() (-> all connections established)
> are going to be slow slugging under more than basic load due to lack
> of "combined memory mapping creation" (so technically speaking
> recommending someone to go to 5.6.x but < 6.5 IMHO is also not good
> advice). See first message in that [1] for a performance report about
> this. IMHVO if we are checking for kernel versions we could also warn
> about performance regression (something like merge those two patches
> if one wants to have a good io_uring experience).
We can probe for that too, which we already do. If you call
pgaio_uring_ring_shmem_size() it will return 0 on Linux <6.5. Which I
think eve further supports probing for the features we need rather than
looking at the kernel version.
Andreas
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