Date: Tue, 10 May 2005 13:10:34 +0200 From: Michael Schuh <michael.schuh@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: Disk-Performace issue? Message-ID: <1dbad315050510041037f52e36@mail.gmail.com> In-Reply-To: <1dbad315050510034688a7fb@mail.gmail.com> References: <1dbad315050510034688a7fb@mail.gmail.com>
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Sorry not my day, i have forgotten to tell you that not only the system load get higher, also the transferrate run under 500kBytes/s from one to another moment. The first files get copied with 3-9 MBytes/s. Thank you. Michael 2005/5/10, Michael Schuh <michael.schuh@gmail.com>: > Hello, >=20 > i have the following Problemdescription. > I work on an AMD 2000+ with 2*160GB-Disks > The Diskperformance tested with bonnie or great filewrites/reads with dd > from /dev/zero or /dev/urandom gaves me an Value from 40-55 MBytes/s. >=20 > Now i have 2 Directories with ~500.000-600.000 files with an size of ~5kB= yte. > by copying the files from one disk to another or an direktory on the same= disk > (equal behavior), i can see this behavior: >=20 > on an PIII 866 the first ~100.000 - 150.000 files > on an AMDK6II450 the first ~100.000 - 120.000 files > on the AMD2000+ the first ~200.000 - 220.000 files > are copied with an relative good performance. >=20 > After this count of files are copied, the system-load get higher, > cppustate ist 0,0% idle and the system uses ~80-90%cpu-load, > rest goin to intr and user.... >=20 > As base i use RELENG_4. >=20 > Can anyone explain me from where this behavior can come? > Come thie eventually from the filesytem, or from my disks, so that > these are to hot? (I think not) >=20 > I have tried out following commands to copy: > tar -cf - . | ( cd <destdir>; tar -xf .) #the fastest and my lovely :-) > find ./ -type f |cpio -pm <destdir> # half-performace as tar > rsync -av <sourcedir>/ <destdir>/ # smarter then tar but bad performace >=20 > mv or any other are not testet while i surely run in to the "too many > Arguments" Problem.... >=20 > thank you for your suggestions >=20 > regards >=20 > michael >
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