On Wed, 13 Jul 2022, Mikulas Patocka wrote: > This commit enables writeback limit by default. It is set to 1GiB or 1/16 The limit is really 256MiB, not 1GiB. I think that 1GiB is too much. Mikulas > of total system memory, whichever is smaller. > > Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > > --- > drivers/md/dm-writecache.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > Index: linux-2.6/drivers/md/dm-writecache.c > =================================================================== > --- linux-2.6.orig/drivers/md/dm-writecache.c 2022-07-13 13:07:52.000000000 +0200 > +++ linux-2.6/drivers/md/dm-writecache.c 2022-07-13 13:08:19.000000000 +0200 > @@ -22,7 +22,7 @@ > > #define HIGH_WATERMARK 50 > #define LOW_WATERMARK 45 > -#define MAX_WRITEBACK_JOBS 0 > +#define MAX_WRITEBACK_JOBS min(0x10000000 / PAGE_SIZE, totalram_pages() / 16) > #define ENDIO_LATENCY 16 > #define WRITEBACK_LATENCY 64 > #define AUTOCOMMIT_BLOCKS_SSD 65536 > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
