From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: Oddities in brd queue limits
Date: Tue, 2 Apr 2024 15:18:22 +0200 [thread overview]
Message-ID: <20240402131822.GA32081@lst.de> (raw)
In-Reply-To: <0cba8c5d-f014-4e48-9a6f-7724cf939c5c@suse.de>
On Tue, Apr 02, 2024 at 03:17:26PM +0200, Hannes Reinecke wrote:
> Hi Christoph,
>
> brd ends up with the following queue limits:
>
> optimal_io_size: 0
> minimum_io_size: 4096
> hw_sector_size: 512
> physical_block_size: 4096
>
> which I find particularly odd; how can the minimum I/O size be _larger_
> than the hw_sector_size? Wouldn't that imply that we can only send I/O
> in units of physical block size, rendering the hw_sector_size pretty much
> pointless?
The minimum_io_size is always larger or equal to hw sector size.
It really is the minimal efficient I/O size.
next prev parent reply other threads:[~2024-04-02 13:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-02 13:17 Oddities in brd queue limits Hannes Reinecke
2024-04-02 13:18 ` Christoph Hellwig [this message]
2024-04-02 13:21 ` Hannes Reinecke
2024-04-02 13:41 ` Christoph Hellwig
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