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From: Hubert Feurstein <h.feurstein@gmail.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [BUG] imx6qdl: degraded eMMC write performance
Date: Tue, 10 Dec 2019 16:43:54 +0100	[thread overview]
Message-ID: <CAFfN3gURy6N4F=u-uCUU-sYabvjBUfts2XeKNyJXfBxY1frKYg@mail.gmail.com> (raw)
In-Reply-To: <20191210151042.pkmavrxwlry3525t@pengutronix.de>

Hi Sascha,

Am Di., 10. Dez. 2019 um 16:10 Uhr schrieb Sascha Hauer
<s.hauer@pengutronix.de>:
[...]
> Well the commit message says it:
> | commit b6fef20c1215c6ef0004f6af4a9c4b77af51dc43
> | Author: Sascha Hauer <s.hauer@pengutronix.de>
> | Date:   Thu Mar 29 13:49:45 2018 +0200
> |
> |     block: Adjust cache sizes
> |
> |     Use four times more cache entries and divide the memory for each entry
> |     by four. This lowers the linear read throughput somewhat but increases
> |     the access speed for filesystems.
Yes, I know. I've read the commit message. But this patch even costs me ~200ms
in boottime (loading kernel and dts from ext4 root partition).

[...]
> We could adjust RW_BUF_SIZE (used by copy_file as buffer size) to a full
> chunk size (16KiB). Does this give you back some lost performance?
No, changing RW_BUF_SIZE did not help.

Regards
Hubert

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  reply	other threads:[~2019-12-10 15:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-10 14:44 Hubert Feurstein
2019-12-10 15:10 ` Sascha Hauer
2019-12-10 15:43   ` Hubert Feurstein [this message]
2019-12-10 16:18     ` Sascha Hauer
2019-12-10 17:46       ` Hubert Feurstein
2019-12-13 13:12 ` Sascha Hauer

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