Date: Sat, 29 Jun 2002 10:42:45 -0700 From: Kent Stewart <kstewart@owt.com> To: A Ling <fbsd2@yahoo.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Memory speed/size vs buildworld time? Message-ID: <3D1DF195.40108@owt.com> References: <20020629165819.83708.qmail@web20204.mail.yahoo.com>
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A Ling wrote: > Greetings all, I'm about to upgrade a box (on a budget), and I was wondering > whether the extra cost (or smaller amount) of PC2700 DDR memory > would be offset by big (say > >> 20%) differences in time for a buildworld, for >> > example? For little more than the price of 256 Mb of PC2700, I > can get 512 Mb of PC2100 from Crucial. I realize SCSI vs IDE > may make more of a difference, but unfortunately that's not an > option. The processor would be a socket 478 P4 1.7 GHz, and I'm considering the ASUS P4S533 motherboard (SiS645DX > chip set). The disks to be migrated are: > > ad0: 9541MB <WDC WD100EB-00BHF0> [19386/16/63] at > ata0-master UDMA100 > ad1: 76319MB <WDC WD800BB-32BSA0> [155061/16/63] at > ata0-slave UDMA100 I have 2 SiS635 based AMD 1600+ XP systems. I have DDR memory in one and 256 SDIM in the other. The one with DDR has 3 HDs connected to the 2-ATA channels. The other system has a Promise Ultra 100 with 3 ATA-100 Maxtor HDs. Each HD is on its own ATA channel. The drives are all split up something like coral# df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/ad0s3a 248047 57465 170739 25% / /dev/ad0s3f 992239 624 912236 0% /tmp /dev/ad0s3g 9477547 5273149 3446195 60% /usr /dev/ad0s3e 992239 145979 766881 16% /var /dev/ad4s2e 1486814 342557 1025312 25% /usr/obj /dev/ad4s3e 12712841 2737107 8958707 23% /usr2 /dev/ad6s2e 1486814 337060 1030809 25% /usr/src Opal is the same but only used ad0, ad1, and ad2. Both will do buildworlds in just over 20 minutes. Opal has 512 MB of DDR and is usually 2 minutes faster than coral. > > Comments on motherboards also welcome; I've got PCI > NIC & video cards I can use, but like the fact that > the C-Media chip set on the ASUS seems to be > supported for sound. If this would be better on > -questions or -hardware, I could repost there. Thanks. > Alex > > > __________________________________________________ > Do You Yahoo!? > Yahoo! - Official partner of 2002 FIFA World Cup > http://fifaworldcup.yahoo.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > > . > > -- Kent Stewart Richland, WA http://users.owt.com/kstewart/index.html > > considering the ASUS P4S533 motherboard (SiS645DX chip set). > The disks to be migrated are: > > ad0: 9541MB <WDC WD100EB-00BHF0> [19386/16/63] at ata0-master > UDMA100 ad1: 76319MB <WDC WD800BB-32BSA0> [155061/16/63] at ata0-slave > UDMA100 I have 2 SiS635 based AMD 1600+ XP systems. I have 512MB DDR memory in one and 256 SDIM in the other. The one with DDR has 3 HDs connected to the 2-ATA channels. The HDs are combinations of ATA-100 to ATA-66. The other system has a Promise Ultra 100 with 3 ATA-100 Maxtor HDs. Each HD is on its own ATA channel. The drives are all split up something like coral# df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/ad0s3a 248047 57465 170739 25% / /dev/ad0s3f 992239 624 912236 0% /tmp /dev/ad0s3g 9477547 5273149 3446195 60% /usr /dev/ad0s3e 992239 145979 766881 16% /var /dev/ad4s2e 1486814 342557 1025312 25% /usr/obj /dev/ad4s3e 12712841 2737107 8958707 23% /usr2 /dev/ad6s2e 1486814 337060 1030809 25% /usr/src Opal is the same but only used ad0, ad1, and ad2. Both will do buildworlds in just over 20 minutes. Opal is the one with 512 MB of DDR and is usually 2 minutes faster than coral. Splitting /usr/obj and /usr/src always helped and this combination was consistantly faster. Memory doesn't seem to matter beyond 128 MB. I have also found that adding -j4 to your buildworld is _ALWAYS_ slower on single cpu system. I have tabulated some of my timing of buildworlds as what I call "The Urban Legend of -j4" but it is no longer up todate. I still do "time make buildworld" and add them to my table via a cat >> times.log and cut and paste the time on the console. I just haven't added the information to my web page. I will have to do that because it also shows what softupdates and caching does. I have a 3rd SiS635 based machine with an AMD-900 Athlon Thunderbird in it. It is fast but not nearly as fast as the 1600+'s. It also has a similar configuration to coral. The behavior with respect to file system was similar to coral. I have a Maxtor Ultra-133 controller, which will be added to opal, and I will see at that time what the DDR memory really does in an identical configuration to coral. Kent > > Comments on motherboards also welcome; I've got PCI NIC & video > cards I can use, but like the fact that the C-Media chip set on > the ASUS seems to be supported for sound. If this would be > better on -questions or -hardware, I could repost there. Thanks. Alex > -- Kent Stewart Richland, WA http://users.owt.com/kstewart/index.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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