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Date:      Sun, 20 Oct 2019 18:14:37 -0600
From:      Warner Losh <imp@bsdimp.com>
To:        bob prohaska <fbsd@www.zefox.net>
Cc:        freebsd-arm@freebsd.org
Subject:   Re: Swap_pager messages when no swap is in use
Message-ID:  <CANCZdfqpH61iaZFXJsdTJhJE%2B95=FXvit6AjvomFOZkMe=8XYg@mail.gmail.com>
In-Reply-To: <20191021000433.GA14127@www.zefox.net>
References:  <20191021000433.GA14127@www.zefox.net>

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On Sun, Oct 20, 2019, 6:04 PM bob prohaska <fbsd@www.zefox.net> wrote:

> While running svnlite to update sources on a Pi3 running -currrent
> I was surprised to notice a flurry of
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 133095, size: 4096
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 136056, size: 4096
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 140560, size: 4096
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 134290, size: 8192
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 124869, size: 16384
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 125113, size: 4096
> swap_pager: indefinite wait buffer: bufobj: 0, blkno: 142799, size: 4096
> messages when no swap seemed to be in use. Gstat reported much congestion
> of the microSD card, holding / and half the swap, but there was no obvious
> activity reading or writing swap, just the root partition.
>
> Should this be considered normal? It strikes me as very odd.
>

It took more than 30s for the IO to complete. Sadly, this is normal for
cheap SD cards.

Warner

Thanks for reading,
>
> bob prohaska
>
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