From: Boaz Harrosh <openosd@gmail.com>
To: "J. Bruce Fields" <bfields@fieldses.org>,
Boaz Harrosh <boazh@netapp.com>
Cc: Chuck Lever <chuck.lever@oracle.com>,
lsf-pc@lists.linux-foundation.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Ric Wheeler <rwheeler@redhat.com>, Jan Kara <jack@suse.cz>,
Steven Whitehouse <swhiteho@redhat.com>,
coughlan@redhat.com, Jeff Moyer <jmoyer@redhat.com>,
Sage Weil <sweil@redhat.com>,
Miklos Szeredi <mszeredi@redhat.com>,
Andy Rudof <andy.rudoff@intel.com>,
Anna Schumaker <Anna.Schumaker@netapp.com>,
Amir Goldstein <amir73il@gmail.com>,
Stephen Bates <stephen@eideticom.com>,
Amit Golander <Amit.Golander@netapp.com>,
Sagi Manole <sagim@netapp.com>,
Shachar Sharon <Shachar.Sharon@netapp.com>,
Josef Bacik <josef@redhat.com>
Subject: Re: [LSF/MM TOPIC ATTEND][RFD] ZUFS - Zero-copy User-mode File System
Date: Mon, 5 Feb 2018 14:53:01 +0200 [thread overview]
Message-ID: <cafcfe95-1c39-f781-6594-4179793726f3@gmail.com> (raw)
In-Reply-To: <20180202154952.GA3875@fieldses.org>
On 02/02/18 17:49, J. Bruce Fields wrote:
<>
>> What about a different interface for a "trusted" binary with "Spectre
>> mitigation" off. I know Redhat guys have a project where they want to
>> sign and verify by Kernel all systemd /sbin/* binaries. If these
>> binaries have such an hardened trust could we make them faster? (ie
>> back to regular speed)
>
> I don't think that helps.
>
If that does not help then I'm clueless. I understood that the
slowdown is because some CPU pipelines need stalling (flushing)
because back-from-kernel call in usermode can (theoretically)
inspect the other side of the un-taken speculated branch .....
So if I trust the user-mode app I can trust it will not misuse
that info?
But again I'm completely clueless. What else then "app trust"
can there be?
> --b.
>
Thanks
Boaz
next prev parent reply other threads:[~2018-02-05 12:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-01 13:51 [LSF/MM TOPIC ATTEND][RFD] ZUFS - Zero-copy User-mode File System Boaz Harrosh
2018-02-01 18:34 ` Chuck Lever
2018-02-01 18:59 ` Boaz Harrosh
2018-02-02 9:36 ` Miklos Szeredi
2018-02-05 13:04 ` Boaz Harrosh
2018-02-05 15:48 ` Miklos Szeredi
2018-02-02 15:49 ` J. Bruce Fields
2018-02-02 16:09 ` Chuck Lever
2018-02-02 16:13 ` Bruce Fields
2018-02-09 17:47 ` Steve French
2018-02-05 12:53 ` Boaz Harrosh [this message]
2018-03-05 12:18 ` Greg KH
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