Date: Sun, 14 Jan 2024 19:14:16 +0100 From: "Patrick M. Hausen" <pmh@hausen.com> To: Warner Losh <imp@bsdimp.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: noatime on ufs2 Message-ID: <14AED5F5-CC24-4A04-89A6-F43628CE563F@hausen.com> In-Reply-To: <CANCZdfosFb1xQdRL9rW1icbVAYbspqnKwWR4CO2guVd5LAv4HA@mail.gmail.com> References: <ZZqmmM-6f606bLJx@int21h> <a5e38bfbabd37084@orthanc.ca> <CAM5tNy4HuHb=GpQXvE4h2NC8_azOwDS3H7wY3UK%2BcE07owPr3A@mail.gmail.com> <4014880.cjyAsbXg9l@ravel> <a5e3a25e0d57d1a9@orthanc.ca> <CANCZdfosFb1xQdRL9rW1icbVAYbspqnKwWR4CO2guVd5LAv4HA@mail.gmail.com>
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Hi folks, that's a really interesting polite and constructive discussion going on here, and a trip down history lane to boot :-) I just want to add one thing to Warner's last argument: > Am 14.01.2024 um 18:58 schrieb Warner Losh <imp@bsdimp.com>: > Though in all honesty, I've never been able to measure a speed difference. > Nor have I worn out a ssd due to the tiny increase in write amp. Recently on the OPNsense forum somehow an increasing number of users started to post worried questions regarding a constant write load on the system disk/SSD in the order of 100 kB/s or some small multitude thereof. Definitely smaller than 1MB/s. That number at first looks like a serious load on the write endurance of your SSD. Then, doing the math it turns out it's absolutely ridiculous. 100 kB/s sums up to 8,640 GB/day (in decimal units). Even the small SSDs typically used for embedded devices like firewalls (32 or 64 G capacity) have a write endurance in the order of 100 or 200 TBW. That's more than 10.000 days or roughly 30 years ... That's why I like following this discussion and every improvement is in then end an improvement, but I consider it mostly a micro optimisation. Kind regards, Patrick P.S. I don't use atime anywhere I knew.
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