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From: Melvin Vermeeren <vermeeren@vermwa.re>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: dm-devel@redhat.com, Milan Broz <mbroz@redhat.com>
Subject: Re: [dm-devel] Integrity discard/trim extremely slow on NVMe SSD storage (~10GiB/minute)
Date: Fri, 30 Apr 2021 21:23:48 +0200	[thread overview]
Message-ID: <2551336.spOdxr4IAQ@verm-r4e> (raw)
In-Reply-To: <alpine.LRH.2.02.2104261124360.24039@file01.intranet.prod.int.rdu2.redhat.com>


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Hi Mikulas,

Got around to checking the patches today, apologies for the delay.

On Monday, 26 April 2021 17:33:32 CEST Mikulas Patocka wrote:
> I tried it on my nvme device (Samsung SSD 960 EVO 500GB) and I could
> discard 32GB in 5 seconds.
> 
> I assume that it is specific to the nvme device you are using. The device
> is perhaps slow due to a mix of dicard+read+write requests that
> dm-integrity generates.

This makes sense to me as well.

> Could you try it on other nvme disks?

I cannot myself personally, but I asked a friend with Crucial P5 NVMe SSD to 
test and there the discards passed through dm-integrity are also well 
performing, so it seems specific so Seagate FireCuda 520.

I contacted Seagate about this problem with some refs and reproduction steps, 
hopefully they will resolve this in a firmware update or I will have to return 
the drives eventually. (The worst part is all I/O blocks hard while handling 
integrity discards, causing really system freeze like experience.)

Thanks,

-- 
Melvin Vermeeren
Systems engineer

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      parent reply	other threads:[~2021-05-03 11:13 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 18:29 [dm-devel] Integrity discard/trim extremely slow on NVMe SSD storage (~10GiB/minute) Melvin Vermeeren
2021-04-26 15:33 ` Mikulas Patocka
2021-04-26 16:02   ` Mikulas Patocka
2021-04-30 19:26     ` Melvin Vermeeren
2021-05-12 19:26       ` Melvin Vermeeren
2021-04-30 19:23   ` Melvin Vermeeren [this message]

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