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Re: Do not use O_SYNC


From: Phillip Susi
Subject: Re: Do not use O_SYNC
Date: Mon, 05 Jan 2015 14:07:47 -0500
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.3.0

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Little old, but seems this was lost.  The relevant code seems to have
been moved to osdep/hostfile_unix.h, but it is still using O_SYNC and
I really don't see any reason why it should.  Can we please get rid of
this?

On 3/20/2013 10:15 AM, Phillip Susi wrote:
> revno: 164 committer: Phillip Susi <address@hidden> branch nick:
> raring timestamp: Wed 2013-03-20 10:00:03 -0400 message: Do not use
> O_SYNC
> 
> The disk was being opened with O_SYNC, and written to one sector at
> a time.  This has a huge time penalty, causing at least one 
> revolution of the disk per sector written. diff: === modified file
> 'grub-core/kern/emu/hostdisk.c' --- grub-core/kern/emu/hostdisk.c
> 2012-09-27 16:16:51 +0000 +++ grub-core/kern/emu/hostdisk.c
> 2013-03-20 14:00:03 +0000 @@ -848,9 +848,6 @@ #ifdef O_LARGEFILE 
> flags |= O_LARGEFILE; #endif -#ifdef O_SYNC -  flags |= O_SYNC; 
> -#endif #ifdef O_FSYNC flags |= O_FSYNC; #endif

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