linux-kernel - Re: [RFC PATCH] riscv: reduce THREAD

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Message-ID: <87bkzjvzpt.fsf@igel.home>
Date:   Mon, 07 Feb 2022 09:38:06 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     David Abdurachmanov <david.abdurachmanov@...il.com>
Cc:     Jisheng Zhang <jszhang@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] riscv: reduce THREAD_SIZE from 16KB to 8KB for RV64

On Feb 07 2022, David Abdurachmanov wrote:

> On Sun, Feb 6, 2022 at 7:53 PM Jisheng Zhang <jszhang@...nel.org> wrote:
>>
>> After irq stack is supported, it's possible to use small THREAD_SIZE.
>> In fact, I tested this patch on a Lichee RV board, looks good so far.
>
> We went from 8K to 16K somewhere in mid-2020 on riscv64 because we
> were seeing some random crashes in various distributions (Debian,
> Fedora, OpenSUSE). Thus we matched what other popular arches do, i.e.
> 16K.

I think NFS is one of the worst offenders.  I'm running an Unleashed
with NFS root, which probably amplifies this.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."