Date: Mon, 4 Mar 2013 16:15:19 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: deeptech71@gmail.com, Don Lewis <truckman@FreeBSD.org>, freebsd-current@FreeBSD.org, peter@rulingia.com, ian@FreeBSD.org Subject: Re: access to hard drives is "blocked" by writes to a flash drive Message-ID: <20130304141519.GA3794@kib.kiev.ua> In-Reply-To: <25327.1362404670@critter.freebsd.dk> References: <201303040712.r247CejP008718@gw.catspoiler.org> <25327.1362404670@critter.freebsd.dk>
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--huq684BweRXVnRxX Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 04, 2013 at 01:44:30PM +0000, Poul-Henning Kamp wrote: > Content-Type: text/plain; charset=3DISO-8859-1 > -------- > In message <201303040712.r247CejP008718@gw.catspoiler.org>, Don Lewis wri= tes: >=20 > >Prior to 231160, the syncer thread would call sync_vnode() for the > >syncer vnode of each mountpoint every 30 seconds [...] >=20 > I agree that the lemming syncer is better, but the fundamental mistake of > only having one syncer thread is probably the root-cause in this case: > One camera-grade flash syncing may take (a lot) more than 30 seconds. >=20 > One mountpoint having trouble (of whatever kind) should not affect > the rest of the mountpoints. >=20 > I'm not sure if the syncer is untangled enough that we can have > per mount-point threads yet, but as soon as we can, we should do that. The problem with "wdrain" is not due to any algorithm in the syncer. I explained it in some details in other mail. --huq684BweRXVnRxX Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iQIcBAEBAgAGBQJRNKx2AAoJEJDCuSvBvK1B4kEP/jI/E6OuUPHAKxRxhKgwdqT4 na1z1cFRq0tfznZ6S1SrPREGkwQkBaXgDhdKZcF01cjRcbrgYmF0VTBeS6lUzWUr ibqzHS2USCthRMnH8ENgUxr2ExIx0S0HbwIMzQkt0KQfE/JZsxxraO08iwaOWJTC VJXalPGl9QEJkpRKccl1UPF4KrIZn3T5HbYqA2tGZQiK0UyNmU6xty1EYSG/M3yf A8/JZUpdAwPicDIvRdDniMgu7CX4JLvbFTjr/sfCH9VOThdbaqZZzZz2GuSqn5cq bi9GAkEJd4loeVA+5RAy4RSQwKeZacQQPT+8F+O1Y32NHWdOgKKb8zg+B2qwAnm4 GdPKWYq9lYfUHSimtH5jwMdBUW6wBF8JI9baDQXmUlrjvhLN3jDt/HRm+y1b/Y4k GzbyBCPMygQKj/Axq5RvGUdeGBcRtUwhe6UE89P7CSy4DnLF5YJKTUy59Unf/F0c r2K5vT2BsRyuW0V+hItBjaa2AtwcLMcmy/Jfbf2f/juHTWx3tYdoVypheZ8O3wRn U1T7ohNgueS8JoD+9KEh7/Wz/iH/cei0YSO5V3vRv5g2t+ykEkM5SGyayR4wcs12 1oYMGpq6hl7vReX3WOVMnAtERHaqfK9LE2sg7JNG/3TVyhqj0sqQ+RqpgxzXEC5t QppEiB2V8JVSeanDDNFr =e4gL -----END PGP SIGNATURE----- --huq684BweRXVnRxX--
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