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

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:

quoted

On 03.07.23 22:19, Tim Cuthbertson wrote:

quoted

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