search for: arc_buf_hdr_t

If I add a new field to arc_buf_hdr_t this has a version impact right? I think I need to add a field to it for dealing with encryption of the L2ARC. I''m assuming it should be added at the end and any assignment or reference to it should be guarded with the usual style of version check ? Is that sufficient ? -- Darren J Mo...

...with this in place under heavy load the kernel panics, because memory with KM_SLEEP cannot be allocated. Here are some statistics of memory usage when the panic occurs: zfs_znode_cache: 356 * 11547 = 4110732 bytes zil_lwb_cache: 176 * 43 = 7568 bytes arc_buf_t: 20 * 7060 = 141200 bytes arc_buf_hdr_t: 188 * 7060 = 1327280 bytes dnode_t: 756 * 162311 = 122707116 bytes !! dmu_buf_impl_t: 332 * 18649 = 6191468 other: 14432256 bytes (regular kmem_alloc()) There is 1GB of RAM, 320MB is for the kernel. 1/3 if kernel memory is configured as ARC''s maximum. When it panics, d...

I?m trying to understand the inner workings of the adaptive replacement cache (arc). I see there are arc_bufs and arc_buf_hdrs. Each arc_buf_hdr points to an arc_buf_t. The arc_buf_t is really one entry in a list of arc_buf_t entries. The multiple entries are accessed through the arc_buf_t?s b_next member. Why does the arc_buf_hdr point to a list of arc_buf_ts and not just one arc_buf_t, i.e.,

Hello. We''re currently using a Sun Blade1000 (2x750MHz, 1G ram, 2x160MB/s mpt scsi buses, skge GigE network) as a NFS backend with ZFS for distribution of free software like Debian (cdimage.debian.org, ftp.se.debian.org) and have run into some performance issues. We are running SX snv_48 and have run with a raidz2 with 7x300G for a while now, just added another 7x300G raidz2 today but

...loc name size in use total in use succeed fail ------------------------- ------ ------ ------ --------- --------- ----- ... dmu_buf_impl_t 192 2029 104328 20348928 326434 0 dnode_t 388 1529 84090 34443264 157309 0 arc_buf_hdr_t 92 13276 26460 2580480 140047 0 arc_buf_t 20 957 5915 143360 225786 0 zil_lwb_cache 184 3 44 8192 149 0 zfs_znode_cache 104 1226 83460 8765440 142715 0 ... Note that the d...