Date: Fri, 29 Apr 2005 14:22:02 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "kama" <kama@pvp.se> Cc: Petri Helenius <pete@he.iki.fi> Subject: Re: Very low disk read performance on 5.x ( was Very low disk performance Highpoint 1820a ) Message-ID: <09e001c54cbe$6eaa7810$7f06000a@int.mediasurface.com> References: <20050428162201.39269.qmail@web41214.mail.yahoo.com><42711726.2000607@centtech.com><006201c54c46$14c0d290$b3db87d4@multiplay.co.uk> <4271EFCA.1060605@samsco.org> <093701c54caa$303aac30$7f06000a@int.mediasurface.com> <20050429150534.L22614@ns1.as.pvp.se>
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Ok thanks for that kama good to have some comparison with 4.x I've changed the subject as this seems definitely like a more generic issue something that needs to be fixed before 5.4 release? ----- Original Message ----- From: "kama" <kama@pvp.se> > > I have just tested on my system between 4.11 and 5.4. Both uses the same > configuration on the write disk. its a RAID1+0 on Compaq SA6404 (ciss) > running UFS1. The write to disk is similar on 4.11 and 5.4, but the read > is 100% slower on 5.4 than 4.11. the R:W condition on 4.11 is 1:1 and on > 5.4 2:1. > > I have tested this with dd and my own written disktest program. The > results on both program is similar. so it isn't dev-null issues. > > I have tested with both 1GB files and 10GB files. 1GB files where really > fast on reading, but i consider them false due to the RAID cache. > > Something is really wrong here... ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.
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