linux-kernel - [PATCH 0/2] block: Reinstate BLK_DEF_MAX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 13 Aug 2015 14:57:55 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	axboe@...nel.dk, hch@...radead.org
Cc:	ed.cashin@....org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] block: Reinstate BLK_DEF_MAX_SECTORS

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(-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/