Marcelo Tosatti wrote: > Hi 8xx folks, <SNIP>
> > Actually, CONFIG_PIN_TLB slowdowns the system, as expected (there are only > 28 usable TLB's instead of 32). > > > v2.6 CONFIG_PIN_TLB: > I-TLB userspace misses: 162113 > I-TLB kernel misses: 135911 > D-TLB userspace misses: 289452 > D-TLB kernel misses: 257039 > > v2.6 without CONFIG_PIN_TLB: > I-TLB userspace misses: 160828 > I-TLB kernel misses: 134746 > D-TLB userspace misses: 253557 > D-TLB kernel misses: 227383 > > Considering that the TLB kernel misses are higher with tlb pinning it appears as though the pinned TLBs are not marked as valid. > The following BDI output shows the pinned, 8MByte data page mapping present, > at 0xc0000000. > > BDI>rds 826 > SPR 826 : 0x00007f00 32512 > BDI>rms 792 0x0c001C00 > BDI>rms 824 1 > BDI>rds 824 > SPR 824 : 0xc00000f0 -1073741584 > BDI>rds 825 > SPR 825 : 0x00000fe0 4064 > BDI>rds 826 > SPR 826 : 0x00007fff 32767 <- "0x00007fff" was 0x00007f00" > initially. > I tried enabling usermode access > without > success. > > There are several 4Kb mappings inside the range covered by this 8Mb TLB > entry, > for example: > > BDI>rms 792 0x0c000200 > BDI>rms 824 1 > BDI>rds 824 > SPR 824 : 0xc0224f17 -1071493353 > BDI>rds 825 > SPR 825 : 0x002241e0 2245088 > BDI>rds 826 > SPR 826 : 0x00007f00 32512 > > And more, without so much detail: > SPR 824 : 0xc0224f17 -1071493353 > SPR 824 : 0xc01fbf17 -1071661289 > SPR 824 : 0xc0246f17 -1071354089 > SPR 824 : 0xc023ff17 -1071382761 > SPR 824 : 0xc7e35f17 - 941400297 > SPR 824 : 0xc0244f17 -1071362281 > SPR 824 : 0xc023ef17 -1071386857 > > Note that protection (SPR 826) is exactly the same as the 8Mbyte page > protection. > > Why is the translation mechanism rejection the pinned mappings? > > Dan, have you ever seen this work? Am I misunderstanding how the pinned > entries are supposed to work? When you load the Mx_EPN of the pinned area is the EV bit being set? > > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded at ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > -- Conn ***************************************************************** Blessed be the heretic, for he causes some to think and unites the rest against him. ***************************************************************** Conn Clark Engineering Assistant clark at esteem.com Electronic Systems Technology Inc. www.esteem.com Stock Ticker Symbol ELST
