Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
From:   Andreas Schwab <schwab@linux-m68k.org>
To:     David Abdurachmanov <david.abdurachmanov@gmail.com>
Cc:     Jisheng Zhang <jszhang@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] riscv: reduce THREAD_SIZE from 16KB to 8KB for RV64
References: <20220206174359.2986-1-jszhang@kernel.org>
        <CAEn-LTrZwq1-6F8PWScGPp1TRk1eaB-7qOrvPjyLhK=OzDTQBQ@mail.gmail.com>
Date:   Mon, 07 Feb 2022 09:38:06 +0100
In-Reply-To: <CAEn-LTrZwq1-6F8PWScGPp1TRk1eaB-7qOrvPjyLhK=OzDTQBQ@mail.gmail.com>
        (David Abdurachmanov's message of "Mon, 7 Feb 2022 10:05:14 +0200")
Message-ID: <87bkzjvzpt.fsf@igel.home>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On Feb 07 2022, David Abdurachmanov wrote:

> On Sun, Feb 6, 2022 at 7:53 PM Jisheng Zhang <jszhang@kernel.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@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."