Date: Fri, 08 Jul 2011 00:51:02 +0200 From: "Hartmann, O." <ohartman@zedat.fu-berlin.de> To: Andriy Gapon <avg@FreeBSD.org> Cc: Adrian Chadd <adrian@FreeBSD.org>, Steve Kargl <sgk@troutmask.apl.washington.edu>, arrowdodger <6yearold@gmail.com>, FreeBSD Current <freebsd-current@FreeBSD.org>, Arnaud Lacombe <lacombar@gmail.com>, "freebsd-performance@freebsd.org" <freebsd-performance@freebsd.org> Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <4E163856.2050300@zedat.fu-berlin.de> In-Reply-To: <4E155A84.1010100@FreeBSD.org> References: <4E1421D9.7080808@zedat.fu-berlin.de> <CALH631=F4bSgNDE4w0qcXGMgGxZRRwCP9n-H4M0c%2B1UEaqWr7Q@mail.gmail.com> <4E147F54.40908@zedat.fu-berlin.de> <20110706162811.GA68436@troutmask.apl.washington.edu> <CACqU3MVLr5VXRovs1uV%2BzHazJi2rrjE9Sp3XzsCPJ0Un06pmDQ@mail.gmail.com> <20110706193636.GA69550@troutmask.apl.washington.edu> <4E14CCE5.4050906@zedat.fu-berlin.de> <CAJ-VmomNcbGggbQePi2kBC7uRJm3BenMNKjsqkH5hFLqudsCvg@mail.gmail.com> <20110707015151.GB71966@troutmask.apl.washington.edu> <CAJ-VmongFDGi0amaqod5_NBQcH%2BguA5QMXtttCjTD=ccB==%2BUQ@mail.gmail.com> <20110707031151.GA72452@troutmask.apl.washington.edu> <4E155A84.1010100@FreeBSD.org>
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On 07/07/11 09:04, Andriy Gapon wrote: > on 07/07/2011 06:11 Steve Kargl said the following: >> Unfortunately, I have neither the brain capacity and time nor >> the money to fix the issue. To solve OP's problem in the >> short, the simplest solution may be to switch to 4BSD. Let's >> face, ULE is not a silver bullet. > I think that piling up different problems into a single discussion, even if they > involve a common component (to a certain degree), is not going to help anybody. > If I have read this thread correctly (and taking the subject line as a witness) > the OP had a problem with heavy I/O activity screwing up interactivity. I think > that it's not the same problem as sub-optimal performance of heavy CPU-bound > load, which is what you reported if I am not mistaken. > This is quibbling. On heavy loads on networ, disk et cetera, isn't there always and also a CPU bound load? Whenever this problem came up, it was brought down by force. Yes, I reported due to the obvious fact that this essential problem involves usability of several workstations. It get more obvious when FreeBSD is used with a GUI. But I also realized, as I reported(!), problems on a headless server, even with several tunings, performed slowly and with increasing numbers over time as recommended here (for instance, kern.sched.preempt_thresh=224 or up to kern.sched.preempt_thresh=512, with little effect). Where, if not here, should such problems be discussed? If we open for each dedicated micro-problem a separate thread, we would never gather that many problems which seem to be related to one single well known 'sweet spot'.
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