Date: Fri, 19 May 1995 07:30:40 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: asami@CS.Berkeley.EDU (Satoshi Asami | =?ISO-2022-JP?B?GyRCQHUbKEI=?= =?ISO-2022-JP?B?GyRCOCsbKEIgGyRCOC0bKEI=?=) Cc: adhir@iagi.net, aledm@pavilion.co.uk, hackers@FreeBSD.org Subject: Re: ram-speed (was Re: Adaptec 2940?) Message-ID: <199505190530.HAA09463@labinfo.iet.unipi.it> In-Reply-To: <199505190411.VAA09502@silvia.HIP.Berkeley.EDU> from "Satoshi Asami | =?ISO-2022-JP?B?GyRCQHUbKEI=?= =?ISO-2022-JP?B?GyRCOCsbKEIgGyRCOC0bKEI=?=" at May 18, 95 09:11:09 pm
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> 49005fb0 0.418 uS/op 2.39e+06 op/S 9.121 Mb/S > 8938c0df 0.170 uS/op 5.89e+06 op/S 22.462 Mb/S What does this test measure ? Is it just reads and writes, or something more ? It looks kind of strange to me that reads take so long (418nS) to complete, even if you have a cache miss every time. BTW, on a couple of systems here, I see values such as 4.810/24.774 (the first looks quite low, I guess I have to play with the setup of the board). Also, the test takes quite long to complete. I noticed that if I reduce the number of loops the results don't change significantly. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 ====================================================================
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