Date: Mon, 7 Feb 2022 00:57:47 -0700 From: Warner Losh <imp@bsdimp.com> To: grarpamp <grarpamp@gmail.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: USB Disk Stalls on -current Message-ID: <CANCZdfo03DcBJ_pkrN90UcqCsm-ObMyRS1Ps3A_R6KsYKzY8EQ@mail.gmail.com> In-Reply-To: <CAD2Ti28KcLcaVaKRk4PVUNKwU-bMgFZe4wydAb6e5G4vetbf1Q@mail.gmail.com> References: <7e8459e4-d708-7750-402c-cda2adf6199f@freebsd.org> <CANCZdfqG-%2B9dfFz-%2BeezZaqbPQN5-mQpw%2B214CkiKC%2B_kmW2ig@mail.gmail.com> <60ebd011-c2b8-3524-1476-123f11128ffe@freebsd.org> <CAD2Ti2_WP8y9tADUYjH5PykPm8oJyqRjrj-%2Bk_xHU99kFbWNxw@mail.gmail.com> <CANCZdfp62bbVNJ=VuD3VaOtPpVLPrMg9jaEha6tw33vfWXRDJA@mail.gmail.com> <CAD2Ti28KcLcaVaKRk4PVUNKwU-bMgFZe4wydAb6e5G4vetbf1Q@mail.gmail.com>
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[-- Attachment #1 --] On Mon, Feb 7, 2022, 12:51 AM grarpamp <grarpamp@gmail.com> wrote: > Yes, some USB hw is very flaky, > but ZFS can work great on these... > > https://www.youtube.com/watch?v=7z526m1jvls > https://www.youtube.com/watch?v=dougISKs2vQ > https://vimeo.com/13758987 > https://www.youtube.com/watch?v=1zIoK_9UzHk Doesn't help the performance hiccups though. If you are waiting for a drive to spin up or come out of power save mode or a USB interface chip to reset, the filesystem isn't going to matter. ZFS does a good job recovering in the face of this, but it's not without a performance hit. Warner [-- Attachment #2 --] <div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 7, 2022, 12:51 AM grarpamp <<a href="mailto:grarpamp@gmail.com">grarpamp@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes, some USB hw is very flaky,<br> but ZFS can work great on these...<br> <br> <a href="https://www.youtube.com/watch?v=7z526m1jvls" rel="noreferrer noreferrer" target="_blank">https://www.youtube.com/watch?v=7z526m1jvls</a><br>; <a href="https://www.youtube.com/watch?v=dougISKs2vQ" rel="noreferrer noreferrer" target="_blank">https://www.youtube.com/watch?v=dougISKs2vQ</a><br>; <a href="https://vimeo.com/13758987" rel="noreferrer noreferrer" target="_blank">https://vimeo.com/13758987</a><br>; <a href="https://www.youtube.com/watch?v=1zIoK_9UzHk" rel="noreferrer noreferrer" target="_blank">https://www.youtube.com/watch?v=1zIoK_9UzHk</a></blockquote></div></div><div dir="auto"><br></div><div dir="auto">Doesn't help the performance hiccups though. If you are waiting for a drive to spin up or come out of power save mode or a USB interface chip to reset, the filesystem isn't going to matter.</div><div dir="auto"><br></div><div dir="auto">ZFS does a good job recovering in the face of this, but it's not without a performance hit.</div><div dir="auto"><br></div><div dir="auto">Warner</div></div>help
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