Hi, Константин Did you try to change BLDCFG_MEMORY_BUS_FREQUENCY_LIMIT and BLDCFG_MEMORY_CLOCK_SELECT in src/mainboard/supermicro/h8qgi/buildOpts.c ? BLDCFG_USE_HT_ASSIST can't be set as TRUE on h8qgi now. I am sorry but I don't know how to debug this issue.
On Thu, Jan 24, 2013 at 3:42 PM, Константин Аладышев <[email protected]> wrote: > I have server Supermicro H8QGI board with 4 AMD Opteron f15 processors and > 128 GB RAM (16x8Gb, 4 dimms per socket, 1 dimm per channel). > > I've tested my board in STREAM and noticed that coreboot gives RAM speed 5 > times slower than original BIOS (16 MB/s against 80 MB/s). > > What can lead to this problem? > > Is it family 15h or motherboard issue? Does another families have such > problem? > > I've dumped registers from coreboot and original BIOS. After that i > enabled/disabled some functions in buildOps.c to make dumps look more > similar. > > Now dumps allmost identical (but RAM speed problem still exist). > > Also i should mention that original BIOS have HT-ASSIST feature enabled, but > i can't enable it in coreboot > (http://www.coreboot.org/pipermail/coreboot/2012-December/073001.html) > > But according to this link > http://www.amd.com/us/products/server/processors/six-core-opteron/Pages/six-core-faq-ht-assist.aspx > HT-ASSIST can increase performance by up to 60% (not 500%!). So i think it > isn't the main problem. > > > -- > coreboot mailing list: [email protected] > http://www.coreboot.org/mailman/listinfo/coreboot -- Yours sincerely, WANG Siyuan -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
