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From: Ming Lei <ming.lei@redhat.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, Yi Zhang <yi.zhang@redhat.com>,
	Luis Chamberlain <mcgrof@kernel.org>,
	John Garry <john.g.garry@oracle.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] block: make queue limits workable in case of 64K PAGE_SIZE
Date: Thu, 2 Jan 2025 10:49:40 +0800	[thread overview]
Message-ID: <Z3X-xMeMuF8j0RDA@fedora> (raw)
In-Reply-To: <0b423229-f928-4210-9351-dca353071231@acm.org>

On Wed, Jan 01, 2025 at 06:30:30PM -0800, Bart Van Assche wrote:
> On 1/1/25 5:56 PM, Ming Lei wrote:
> > In RH lab, it has been found that max segment size of some mmc card is
> > less than 64K, then this kind of card can't work in case of 64K PAGE_SIZE.
> 
> That means that that MMC card is incompatible with the 64K page size.

Is there any such linux kernel compatibility standard? If yes, please share
it here.

> 
> Additionally, this patch looks wrong to me. There are good reasons why the
> block layer requires that the DMA segment size is at least as large
> as the page size.

Do you think 512byte sector can't be DMAed?

> 
> You may want to take a look at this rejected patch series:
> Bart Van Assche, "PATCH v6 0/8] Support limits below the page size",
> June 2023 (https://lore.kernel.org/linux-block/20230612203314.17820-1-bvanassche@acm.org/).

'502 Bad Gateway' is returned for the above link.

Thanks,
Ming


  reply	other threads:[~2025-01-02  2:49 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-02  1:56 [PATCH] block: make queue limits workable in case of 64K PAGE_SIZE Ming Lei
2025-01-02  2:30 ` Bart Van Assche
2025-01-02  2:49   ` Ming Lei [this message]
2025-01-02  3:46     ` Bart Van Assche
2025-01-03  2:01       ` Ming Lei
2025-01-03 22:12         ` Bart Van Assche
2025-01-04  1:47           ` Luis Chamberlain
2025-01-04  2:15             ` Bart Van Assche
2025-01-04  4:04               ` Luis Chamberlain
2025-01-04 22:30                 ` Bart Van Assche
2025-01-08 19:32                   ` Luis Chamberlain
2025-01-05  0:59                 ` Keith Busch
2025-01-08 19:12                   ` Luis Chamberlain
2025-01-06  1:20           ` Ming Lei

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