Date: Tue, 19 Oct 2004 14:58:38 -0400 From: Kenneth Culver <culverk@sweetdreamsracing.biz> To: Emanuel Strobl <Emanuel.Strobl@gmx.net> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <20041019145838.g0c0kwk0wcss04ks@www.sweetdreamsracing.biz> In-Reply-To: <200410192031.12504.Emanuel.Strobl@gmx.net> References: <20041015190638.C5A0E5D04@ptavv.es.net> <200410192031.12504.Emanuel.Strobl@gmx.net>
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Quoting Emanuel Strobl <Emanuel.Strobl@gmx.net>: > Am Samstag, 16. Oktober 2004 19:44 schrieb fandino: > [...] >> > Also, make sure that disk write-cache is enabled on both or disabled on >> > both. >> >> write-cache was enable on all tests and disks were in UDMA5 mode. >> >> In this new round of tests I add FreeBSD witch async and OpenBSD (always >> using the same hardware). FreeBSD is by far, the worst throughput of all >> (about 50% slower than others) :-? >> >> GNU/Linux 2.4.18 with ext2: 56848 K/sec >> FreeBSD 5.3b7 with default fs: 26347 K/sec >> FreeBSD 5.3b7 with default fs(async): 26566 K/sec >> FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec >> FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec >> FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec >> OpenBSD 3.5 UFS fs: 55277 K/sec >> >> * Each disk of the raid had a throughput of approx. 15000 K/sec >> ** Each disk of the raid had a throughput of approx. 7500 K/sec >> Each disk of the read split the throughput by half. >> >> How is possible that FreeBSD performs as bad? > > I have to confirm that I also have even worse transfer rates. > It's a ICH2 (i815e) with a not so brand new 80GB WD, but I'd expext about > 50MB/s and I get 16MB/s. > > One interesting thing is that the transferrate is constant with blocksizes > from 256 Byte on. Only with a blocksize of 128 Bytes I can see reduced > throughput (10MB/s). > I can remember, when I last did such "esoteric" tests throughput reached > maximum at about 16k blocksize and rapidly degraded with blocksizes smaller > than 10k. But now only very very small blocksizes limit the throughput! > > Some excerpts: (i815 ich2, 5.3-RC1, custom kernel) > > cale:/usr#22: atacontrol mode 0 > Master = UDMA100 > Slave = BIOSPIO > > ATA channel 0: > Master: ad0 <WDC WD800AB-00CBA0/03.06A03> ATA/ATAPI revision 5 > > atapci0: <Intel ICH2 UDMA100 controller> port > 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0 > ata0: channel #0 on atapci0 > ata1: channel #1 on atapci0 > > cale:/usr#25: uname -a > FreeBSD cale.flintsbach.schmalzbauer.de 5.3-STABLE FreeBSD 5.3-STABLE #4: Sun > Oct 17 02:33:58 CEST 2004 > root@cale.flintsbach.schmalzbauer.de:/usr/obj/usr/src/sys/CALE i386 your poor performance could be because you have a UDMA100 device on the same channel as a BIOSPIO device. I'd try taking the BIOSPIO device off that channel and see what happens. Ken
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