Date: Thu, 07 Jul 2011 16:15:54 -0700 From: Chuck Swiger <cswiger@mac.com> To: "Hartmann, O." <ohartman@zedat.fu-berlin.de> Cc: freebsd-performance@freebsd.org, FreeBSD current <freebsd-current@FreeBSD.org> Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <5C3302CF-8EE7-489E-8D31-624DA1637B73@mac.com> In-Reply-To: <4E163856.2050300@zedat.fu-berlin.de> 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> <4E163856.2050300@zedat.fu-berlin.de>
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On Jul 7, 2011, at 3:51 PM, Hartmann, O. wrote: > This is quibbling. On heavy loads on networ, disk et cetera, isn't there always and also a CPU bound load? No. Properly written software blocks when waiting on network or disk I/O, and doesn't sit there spinning in a busy-wait consuming CPU until it actually gets more work to do. See select(2), kqueue(2), and friends. Regards, -- -Chuck
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