Re: Scrub of my nvme SSD has slowed by about 2/3

[Martin Steigerwald <martin@lichtvoll.de>]

Hi Thorsten, Qu, Tim, everyone,

Linux regression tracking #update (Thorsten Leemhuis) - 29.08.23, 14:17:33 
CEST:
> On 12.07.23 13:02, Linux regression tracking #adding (Thorsten Leemhuis)
> wrote:
> > On 03.07.23 22:19, Tim Cuthbertson wrote:
> >> Yesterday, I noticed that a scrub of my main system filesystem has
> >> slowed from about 2.9 gb/sec to about 949 mb/sec. My scrub used to
> >> run
> >> in about 12 seconds, now it is taking 51 seconds. I had just
> >> installed
> >> Linux kernel 6.4.1 on Arch Linux, upgrading from 6.3.9. At first I
> >> suspected the new kernel, but now I am not so sure.
> > 
> > Thanks for the report. It seems it will take some work to address
> > this,
> > so to be sure the issue doesn't fall through the cracks unnoticed, I'm
> > adding it to regzbot, the Linux kernel regression tracking bot:
> > 
> > #regzbot ^introduced e02ee89baa66
> 
> #regzbot resolve: various changes merged for 6.6 improve things again;
> more planned; backporting is planned, too;
> #regzbot ignore-activity
> 
> (yes, that is not idea, but that's how it is sometimes)

ideal?

Scrubbing "/home" with 304.61GiB (interestingly both back then with 6.4 
and now with 6.5.2):

- 6.4: 966.84MiB/s
- 6.5.2:  748.02MiB/s

I expected an improvement.

Same Lenovo ThinkPad T14 AMD Gen 1 with AMD Ryzen 7 PRO 4750U, 32 GiB RAM 
and 2TB Samsung 980 Pro NVME SSD as before.

Ciao,
-- 
Martin