Re: Dell 2950: 4GB not seen (amd64; works on other 2950:s)
> Derek triggered a thought ... I believe the 2950s have the ability to > do "RAM RAID1", to increase RAM reliability. If that belief is correct, > it could be that you've got 4G physically in the machine, but only 2G > logically available to the OS. > > At least, I think I remember seeing an option like that in a BIOS ... Now that you mention it I do think I recognize that. It would fit with the ~ 2 GB visible memory, but on the other hand the kernel does print the full 4 GB during boot. But will definitely have to look into that. Thanks! -- / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <[EMAIL PROTECTED]>' Key retrieval: Send an E-Mail to [EMAIL PROTECTED] E-Mail: [EMAIL PROTECTED] Web: http://www.scode.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dell 2950: 4GB not seen (amd64; works on other 2950:s)
> You need to look closely at the hardware configuration for these servers > and their motherboards. Often some memory is reserved for things like > onboard video, etc. You can free up that video memory by adding a separate > video card, but necessarily other memory that may be used by the > motherboard. Unfortunately with dell systems same model's don't > necessarily mean same motherboard. Also, how memory is used via the BIOS > is dependent on the BIOS version. You should try to be sure all systems > you want to compare have the same motherboard and chipset and that these > also have the same BIOS version. I'll have a closer look and inquire with Dell what the intended functionality is (hopefully it doesn't turn out to be something that requires Windows/Linux to work around). Thanks! -- / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <[EMAIL PROTECTED]>' Key retrieval: Send an E-Mail to [EMAIL PROTECTED] E-Mail: [EMAIL PROTECTED] Web: http://www.scode.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dell 2950: 4GB not seen (amd64; works on other 2950:s)
In response to Derek Ragona <[EMAIL PROTECTED]>: > At 02:48 PM 8/24/2007, Peter Schuller wrote: > >Hello, > > > >I have a Dell 2950 where my 7-CURRENT amd64 FreeBSD does not see all visible > >memory. It has 4 GB of physical RAM. dmesg on boot includes: > > > >usable memory = 4280811520 (4082 MB) > >avail memory = 4117716992 (3926 MB) > > > >Yet summing memories visible in top yields ~ 2100 MB. > > > >Of note is that I have 6.2/amd64 on several other 2950:s with 4GB of RAM > >which > >say on boot: > > > >real memory = 5100273664 (4864 MB) > >avail memory = 4122443776 (3931 MB) > > > >But has all 4 GB visible in top. > > > >Unfortunately I failed to notice this until after the machine has begun being > >used, so I have limited possibilities for rebooting/mucking with BIOS > >settings. I was hoping someone could suggest something right off the bat. > > > >In addition on the problem machine the following sysctl values are present: > > > >hw.physmem: 4280811520 > >hw.usermem: 3628220416 > >hw.realmem: 5100273664 > >hw.cbb.start_memory: 2281701376 > >hw.pci.host_mem_start: 2147483648 > > > >With hw.usermem being slightly higher (but not 2 GB higher) on the 6.2 system > >without a problem: > > > >hw.physmem: 4283285504 > >hw.usermem: 3998797824 > >hw.realmem: 5100273664 > >hw.cbb.start_memory: 2281701376 > >hw.pci.host_mem_start: 2147483648 > > > >I was under the impression that memory visibility issues were a thing of the > >past on amd64. Any insight? > > > >Thanks! > > > >-- > >/ Peter Schuller > > You need to look closely at the hardware configuration for these servers > and their motherboards. Often some memory is reserved for things like > onboard video, etc. You can free up that video memory by adding a separate > video card, but necessarily other memory that may be used by the > motherboard. Unfortunately with dell systems same model's don't > necessarily mean same motherboard. Also, how memory is used via the BIOS > is dependent on the BIOS version. You should try to be sure all systems > you want to compare have the same motherboard and chipset and that these > also have the same BIOS version. Derek triggered a thought ... I believe the 2950s have the ability to do "RAM RAID1", to increase RAM reliability. If that belief is correct, it could be that you've got 4G physically in the machine, but only 2G logically available to the OS. At least, I think I remember seeing an option like that in a BIOS ... -- Bill Moran http://www.potentialtech.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Dell 2950: 4GB not seen (amd64; works on other 2950:s)
At 02:48 PM 8/24/2007, Peter Schuller wrote: Hello, I have a Dell 2950 where my 7-CURRENT amd64 FreeBSD does not see all visible memory. It has 4 GB of physical RAM. dmesg on boot includes: usable memory = 4280811520 (4082 MB) avail memory = 4117716992 (3926 MB) Yet summing memories visible in top yields ~ 2100 MB. Of note is that I have 6.2/amd64 on several other 2950:s with 4GB of RAM which say on boot: real memory = 5100273664 (4864 MB) avail memory = 4122443776 (3931 MB) But has all 4 GB visible in top. Unfortunately I failed to notice this until after the machine has begun being used, so I have limited possibilities for rebooting/mucking with BIOS settings. I was hoping someone could suggest something right off the bat. In addition on the problem machine the following sysctl values are present: hw.physmem: 4280811520 hw.usermem: 3628220416 hw.realmem: 5100273664 hw.cbb.start_memory: 2281701376 hw.pci.host_mem_start: 2147483648 With hw.usermem being slightly higher (but not 2 GB higher) on the 6.2 system without a problem: hw.physmem: 4283285504 hw.usermem: 3998797824 hw.realmem: 5100273664 hw.cbb.start_memory: 2281701376 hw.pci.host_mem_start: 2147483648 I was under the impression that memory visibility issues were a thing of the past on amd64. Any insight? Thanks! -- / Peter Schuller You need to look closely at the hardware configuration for these servers and their motherboards. Often some memory is reserved for things like onboard video, etc. You can free up that video memory by adding a separate video card, but necessarily other memory that may be used by the motherboard. Unfortunately with dell systems same model's don't necessarily mean same motherboard. Also, how memory is used via the BIOS is dependent on the BIOS version. You should try to be sure all systems you want to compare have the same motherboard and chipset and that these also have the same BIOS version. -Derek PGP userID: 0xE9758B7D or 'Peter Schuller <[EMAIL PROTECTED]>' Key retrieval: Send an E-Mail to [EMAIL PROTECTED] E-Mail: [EMAIL PROTECTED] Web: http://www.scode.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks transtec Computers for their support. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks transtec Computers for their support. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
