On Wed, May 04 2011 at 11:10am -0400, Martin K. Petersen <martin.petersen@oracle.com> wrote: > >>>>> "Lukas" == Lukas Czerner <lczerner@redhat.com> writes: > > Lukas> Nevertheless there is something weird going on, because even when > Lukas> I create striped volume I get this: > > Could you please try the following patch? It has a bunch of small tweaks > to the discard stack in it. I'll split it up before posting for real but > I'd like to know if it fixes your issue... > > > block/libata/scsi: Various logical block provisioning fixes > > - Add sysfs documentation for the discard topology parameters > > - Fix discard stacking problem > > - Switch our libata SAT over to using the WRITE SAME limits > > - UNMAP alignment needs to be converted to bytes > > - Only report alignment and zeroes_data if the device supports discard > > Reported-by: Lukas Czerner <lczerner@redhat.com> > Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> > > diff --git a/block/blk-settings.c b/block/blk-settings.c > index 1fa7692..42d3bf5 100644 > --- a/block/blk-settings.c > +++ b/block/blk-settings.c > @@ -120,7 +120,7 @@ void blk_set_default_limits(struct queue_limits *lim) > lim->discard_granularity = 0; > lim->discard_alignment = 0; > lim->discard_misaligned = 0; > - lim->discard_zeroes_data = -1; > + lim->discard_zeroes_data = 1; > lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; > lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); > lim->alignment_offset = 0; lim->discard_zeroes_data = -1; was suspect to me too. But why default to 1 here? > @@ -166,6 +166,7 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) > > blk_set_default_limits(&q->limits); > blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS); > + q->limits.discard_zeroes_data = 0; > > /* > * by default assume old behaviour and bounce for any highmem page Only to then reset to 0 here? Shouldn't we default to 0 and only set to 1 where applicable (e.g. sd_config_discard)? _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
