Date: Sat, 2 Mar 2013 21:46:39 +0100 From: =?iso-8859-2?Q?Edward_Tomasz_Napiera=B3a?= <trasz@FreeBSD.org> To: deeptech71 <deeptech71@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: access to hard drives is "blocked" by writes to a flash drive Message-ID: <42B72A5B-A363-426B-9F6C-7F8B3B7E7543@FreeBSD.org> In-Reply-To: <51323712.5000406@gmail.com> References: <51323712.5000406@gmail.com>
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Wiadomo=B6=E6 napisana przez deeptech71 w dniu 2 mar 2013, o godz. = 18:29: > When one of my flash drives is being heavily written to; typically by = ``svn update'' on /usr/src, located on the flash drive; the following = can be said about filesystem behavior: >=20 > - ``svn update'' seems to be able to quickly update a bunch of files, = but is then unable to continue for a period of time. This behavior is = cyclical, and cycles several times, depending on the amount of updating = work to be done for a particular run of ``svn update''. > - Access to any filesystem, whether on the said flash drive or not, = seems to be hindered a lot, typically during the said "unable to = continue" time. Reading of a file on a hard drive was once delayed for = more than 10 seconds. Seemingly as a consequence, the starting of top(1) = is also typically delayed. When that happens, could you do "ps axl" and see the WCHAN column for the affected processes? Is it "wdrain"? --=20 If you cut off my head, what would I say? Me and my head, or me and my = body?
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