From: Jeff Moyer <jmoyer@redhat.com>
To: axboe@kernel.dk, hch@infradead.org
Cc: ed.cashin@acm.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] block: Reinstate BLK_DEF_MAX_SECTORS
Date: Thu, 13 Aug 2015 14:57:55 -0400 [thread overview]
Message-ID: <1439492277-14638-1-git-send-email-jmoyer@redhat.com> (raw)
Commit 34b48db66e08 (block: remove artificial max_hw_sectors cap)
caused performance regressions for streaming I/O workloads across
a range of storage from SATA disks to enterprise storage arrays.
I was unable to actually show a performance gain for any storage
I have access to. However, the patch was introduced to boost
performance on software RAID over SATA disks, and I don't have
access to such a configuration.
The compromise is to reinstate BLK_DEF_MAX_SECTORS, but to bump it
up to 2560 from 1024. This number should allow full stripe writes
to 10 data disks with a chunk size of 128KB, and at the same time
does not regress the storage I have access to.
[PATCH 1/2] Revert "block: remove artifical max_hw_sectors cap"
[PATCH 2/2] block: bump BLK_DEF_MAX_SECTORS to 2560
block/blk-settings.c | 4 +++-
drivers/block/aoe/aoeblk.c | 2 +-
include/linux/blkdev.h | 1 +
3 files changed, 5 insertions(+), 2 deletions(-)
next reply other threads:[~2015-08-13 18:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-13 18:57 Jeff Moyer [this message]
2015-08-13 18:57 ` [PATCH 1/2] Revert "block: remove artifical max_hw_sectors cap" Jeff Moyer
2015-08-15 1:18 ` Ed Cashin
2015-08-13 18:57 ` [PATCH 2/2] block: bump BLK_DEF_MAX_SECTORS to 2560 Jeff Moyer
2015-08-18 20:22 ` [PATCH 0/2] block: Reinstate BLK_DEF_MAX_SECTORS Jens Axboe
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