Date: Tue, 28 Sep 1999 00:51:47 +0200 (MET DST) From: Gerard Roudier <groudier@club-internet.fr> To: "Kenneth D. Merry" <ken@kdm.org> Cc: Kevin Street <street@iname.com>, scsi@FreeBSD.ORG Subject: Re: sym driver 0.3.0 Message-ID: <Pine.LNX.3.95.990928003959.429A-100000@localhost> In-Reply-To: <199909271956.NAA38933@panzer.kdm.org>
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On Mon, 27 Sep 1999, Kenneth D. Merry wrote: > ccd0 da0 da1 da2 > KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s > 8.00 994 7.76 8.00 49 0.38 8.00 521 4.07 8.00 472 3.69 > 8.00 1010 7.89 0.00 0 0.00 8.00 487 3.81 8.00 523 4.08 > 8.00 1012 7.91 0.00 0 0.00 8.00 489 3.82 8.00 523 4.08 This sym_hipd driver can perform at least 5 times the above number of 8K transactions per second on 1 LVD BUS given appropriate hard disks (even if reselections are used). So, such a poor testing is inappropriate for the sym_hipd driver that would absolutely not be the bottleneck.=20 (Btw, using a 875 the sym_hipd driver should be able to perform about=20 4 times the above Tps given appripriate hard disks) > Now that's a fair number of transactions per second, and certainly not a > bad benchmark of drive and controller performance. >=20 > Later stages of the dump don't go as fast, since they don't necessarily d= o > everything in 8K chunks. Here is sample iostat output from stage 4 of th= e > same dump on the same system: >=20 > ccd0 da0 da1 da2 > KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s > 4.66 623 2.84 0.00 0 0.00 4.76 301 1.40 4.58 322 1.44 > 3.85 381 1.43 0.00 0 0.00 3.73 195 0.71 3.97 186 0.72 > 3.99 434 1.69 0.00 0 0.00 3.85 188 0.71 4.10 246 0.98 > 4.32 447 1.88 0.00 0 0.00 4.39 226 0.97 4.24 221 0.91 This one is still inadequate. > So the transaction counts vary widely, and the average throughput isn't > all that great for a pair of drives that can otherwise do at least 30MB/s= ec > together. But the number of transactions is still fairly high. >=20 > I think what you may want to do is ask Kevin to give you some comparisons > of iostat output from dumps with the ncr driver and dumps with the sym > driver, so you can compare how many average transactions per second happe= n > in each stage of the dump with each driver. That might shed light on > whether there are any significant performance differences between the > drivers. I will not ask anything, but Kevin can post anything he wants, and I will reply to him. G=E9rard. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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