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Illumos 5027 - zfs large block support

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5027 zfs large block support
Reviewed by: Alek Pinchuk <pinchuk.alek@gmail.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>
Reviewed by: Richard Elling <richard.elling@richardelling.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5027
  https://github.com/illumos/illumos-gate/commit/b515258

Porting Notes:

* Included in this patch is a tiny ISP2() cleanup in zio_init() from
Illumos 5255.

* Unlike the upstream Illumos commit this patch does not impose an
arbitrary 128K block size limit on volumes.  Volumes, like filesystems,
are limited by the zfs_max_recordsize=1M module option.

* By default the maximum record size is limited to 1M by the module
option zfs_max_recordsize.  This value may be safely increased up to
16M which is the largest block size supported by the on-disk format.
At the moment, 1M blocks clearly offer a significant performance
improvement but the benefits of going beyond this for the majority
of workloads are less clear.

* The illumos version of this patch increased DMU_MAX_ACCESS to 32M.
This was determined not to be large enough when using 16M blocks
because the zfs_make_xattrdir() function will fail (EFBIG) when
assigning a TX.  This was immediately observed under Linux because
all newly created files must have a security xattr created and
that was failing.  Therefore, we've set DMU_MAX_ACCESS to 64M.

* On 32-bit platforms a hard limit of 1M is set for blocks due
to the limited virtual address space.  We should be able to relax
this one the ABD patches are merged.

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #354
This commit is contained in:
Matthew Ahrens
2014-11-03 12:15:08 -08:00
committed by Brian Behlendorf
parent 3df293404a
commit f1512ee61e
55 changed files with 613 additions and 155 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zio.c
+22 -7
View File
@@ -24,6 +24,7 @@
* Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/sysmacros.h>
#include <sys/zfs_context.h>
#include <sys/fm/fs/zfs.h>
#include <sys/spa.h>
@@ -107,9 +108,8 @@ zio_init(void)
/*
* For small buffers, we want a cache for each multiple of
* SPA_MINBLOCKSIZE. For medium-size buffers, we want a cache
* for each quarter-power of 2. For large buffers, we want
* a cache for each multiple of PAGESIZE.
* SPA_MINBLOCKSIZE. For larger buffers, we want a cache
* for each quarter-power of 2.
*/
for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
size_t size = (c + 1) << SPA_MINBLOCKSHIFT;
@@ -117,7 +117,16 @@ zio_init(void)
size_t align = 0;
size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0;
while (p2 & (p2 - 1))
#ifdef _ILP32
/*
* Cache size limited to 1M on 32-bit platforms until ARC
* buffers no longer require virtual address space.
*/
if (size > zfs_max_recordsize)
break;
#endif
while (!ISP2(p2))
p2 &= p2 - 1;
#ifndef _KERNEL
@@ -132,10 +141,8 @@ zio_init(void)
#endif
if (size <= 4 * SPA_MINBLOCKSIZE) {
align = SPA_MINBLOCKSIZE;
} else if (IS_P2ALIGNED(size, PAGESIZE)) {
align = PAGESIZE;
} else if (IS_P2ALIGNED(size, p2 >> 2)) {
align = p2 >> 2;
align = MIN(p2 >> 2, PAGESIZE);
}
if (align != 0) {
@@ -174,6 +181,14 @@ zio_fini(void)
kmem_cache_t *last_data_cache = NULL;
for (c = 0; c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; c++) {
#ifdef _ILP32
/*
* Cache size limited to 1M on 32-bit platforms until ARC
* buffers no longer require virtual address space.
*/
if (((c + 1) << SPA_MINBLOCKSHIFT) > zfs_max_recordsize)
break;
#endif
if (zio_buf_cache[c] != last_cache) {
last_cache = zio_buf_cache[c];
kmem_cache_destroy(zio_buf_cache[c]);