Date: Sun, 02 Dec 2018 07:03:55 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Warner Losh <imp@bsdimp.com> Cc: RW <rwmaillists@googlemail.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: How to use trim command ?,Re: How to use trim command ? Message-ID: <60912.1543734235@critter.freebsd.dk> In-Reply-To: <CANCZdfrb0gWAhSUAVvs0pBjezWgh3c_kHjriknC02KZF%2BMVE9A@mail.gmail.com> References: <7e69211c-6ffb-6155-b17a-a845c0b3586d@grosbein.net> <20181201.093153.893601099798031027.ish@amail.plala.or.jp> <1c7139bd-258c-e7d2-2572-052da3803b3b@freebsd.org> <20181201.202332.546134930481017424.ish@amail.plala.or.jp> <CANCZdfqsVo_mk4TqJy8pmp%2BDQvDSg-cgwxM03%2BxgT5_Y%2BVKvnA@mail.gmail.com> <12404.1543699424@critter.freebsd.dk> <20181201222424.0ae8abfd@gumby.homeunix.com> <1177.1543704042@critter.freebsd.dk> <CANCZdfrb0gWAhSUAVvs0pBjezWgh3c_kHjriknC02KZF%2BMVE9A@mail.gmail.com>
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-------- In message <CANCZdfrb0gWAhSUAVvs0pBjezWgh3c_kHjriknC02KZF+MVE9A@mail.gmail= .com>, Warner Losh writes: >Erase has become super expensive with QLC nand. And many SSDs are trying = to >use simpler, smaller data structures to implement its LUTs. They may not have a choice, there are patent-issues in this space. Still, I would avoid any SSD which has issues in this space for normal filesystem operations. -- = Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe = Never attribute to malice what can adequately be explained by incompetence= .
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