Hi all I found the output of diskinfo inside VM of AHCI disk as follow, no TRIM support. root@smart:~ # diskinfo -v ada0 ada0 512 # sectorsize 21474836480 # mediasize in bytes (20G) 41943040 # mediasize in sectors 131072 # stripesize 0 # stripeoffset 41610 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. BHYVE SATA DISK # Disk descr. BHYVE-0B98-104F-E9A7 # Disk ident. No # TRIM/UNMAP support 0 # Rotation rate in RPM Not_Zoned # Zone Mode
Also camcontrol identify ada0 -v show not support of TRIM Data Set Management (DSM/TRIM) no I check to pci_ahci.c, TRIM support is decided by block_if.c's candelete flag. while candelete is decided here strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name)); arg.len = sizeof(arg.value.i); if (ioctl(fd, DIOCGATTR, &arg) == 0) candelete = arg.value.i; Obvious file backend will not have the candelete flag. If the backend storage support TRIM, I think we should present TRIM ability to VM. Any better idea to check whether backend storage support TRIM or not, so we can enable it. Thanks. _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"