atom feed21 messages in org.freebsd.freebsd-fsVery inconsistent (read) speed on UFS2
FromSent OnAttachments
Lev SerebryakovAug 30, 2011 12:10 pm 
Lev SerebryakovAug 30, 2011 12:17 pm 
Kirk McKusickAug 30, 2011 1:08 pm 
Lev SerebryakovAug 30, 2011 3:13 pm 
Lev SerebryakovAug 30, 2011 3:29 pm 
Lev SerebryakovAug 30, 2011 3:31 pm 
Bob FriesenhahnAug 30, 2011 3:39 pm 
Kirk McKusickAug 30, 2011 4:00 pm 
Jeremy ChadwickAug 30, 2011 5:42 pm 
Daniel KalchevAug 31, 2011 12:10 am 
Lev SerebryakovAug 31, 2011 12:38 am 
Lev SerebryakovAug 31, 2011 1:02 am 
Lev SerebryakovAug 31, 2011 1:10 am 
Lev SerebryakovAug 31, 2011 1:18 am 
Lev SerebryakovAug 31, 2011 1:36 am 
Daniel KalchevAug 31, 2011 1:48 am 
Lev SerebryakovAug 31, 2011 2:03 am 
Jeremy ChadwickAug 31, 2011 3:11 am 
Lev SerebryakovAug 31, 2011 4:36 am 
Daniel KalchevAug 31, 2011 4:46 am 
Lev SerebryakovAug 31, 2011 5:49 am 
Subject:Very inconsistent (read) speed on UFS2
From:Lev Serebryakov (le@FreeBSD.org)
Date:Aug 30, 2011 12:10:01 pm
List:org.freebsd.freebsd-fs

Hello, Freebsd-fs.

Now, when I "defragmented" my large FS, I see very inconsistent read speeds on same files. Is it Ok?

My setup is:

(1) FreeBSD 8.2-STABLE/x64 (2) E4400 CPU, 2GiB RAM (3) 5xHDDs in RAID5 (software), controller is ICH9R. (4) UFS2 with 32KiB block, vfs.read_max=32 (1MiB read-ahead). (5) System and swap on another (6th) HDD, but swap is unused. (6) No periodic or background processes access FS in question at all.

Simple program reads each of 12 files (420MiB each) 15 times in cycle like 01, 02, ..., 12, 01,... so, cache in memory should be thrashed, as
programe returns to dame data every ~5.5GiB and here are only 2GiB physical memory in system.

-- // Black Lion AKA Lev Serebryakov <le@FreeBSD.org>

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