Re: mpt Serious performance issues
Hi all, some new findings on this issue: -The OpenBSD driver for this chip is called mpi and performs better (Write speed ~35MB/s, Read speed ~70 MB/s). -Speking of write caching, the NetBSD driver does not seem to have code which could activate it. There is a bit defined in mpt_mpilib.h which could be set in some kind of settings page (_RAID_VOL0_SETTINGS): #define MPI_RAIDVOL0_SETTING_WRITE_CACHING_ENABLE (0x0001) -The OpenBSD driver has a function to (de)activate the write caching called mpi_ioctl_cache() (see: http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/dev/ic/mpi.c?rev=1.165;content-type=text%2Fplain ). How would this be implemented in NetBSD? As a hack for testing, does anybody see a chance to hard-code this bit-setting into the driver? Regards, Stephan
Re: turning off COMPAT_386BSD_MBRPART in disklabel
PR 44496 notes that COMPAT_386BSD_MBRPART is still enabled in disklabel(8), even though it was turned off by default in the kernel early in 4.99.x. The PR also notes that it's not harmless to leave it on. I'm inclined to turn it off in disklabel(8) right now. There's no particular reason to have it there if the kernel doesn't support it, and since fixing up a really old disk doesn't require disklabel(8), only fdisk(8) there doesn't seem to be any upgrade/compatibility argument to have it in -6. I wonder if it's worth to add a sysctl knob that returns whether the running kernel has options COMPAT_386BSD_MBRPART or not and make disklabel(8) refer it. --- Izumi Tsutsui
Re: turning off COMPAT_386BSD_MBRPART in disklabel
dholland-t...@netbsd.org said: PR 44496 notes that COMPAT_386BSD_MBRPART is still enabled in disklabel(8), even though it was turned off by default in the kernel early in 4.99.x. The PR also notes that it's not harmless to leave it on. The PR rather leads to the conclusion that the support for old Partition IDs in disklabel(8) is suboptimal. Originally, the code did only consider a partition with the old ID if no new one was found. This apparently got broken when extended partition support was added years later. best regards Matthias Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDirig Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt
