netdev - Re: [PATCH v9 1/4] PCI: Add new PCIe Fabric End Node flag, PCI_DEV_FLAGS_NO_RELAXED

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-prev] [day] [month] [year] [list]

Date:   Wed, 9 Aug 2017 20:11:33 +0000
From:   Casey Leedom <leedom@...lsio.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>
CC:     Bjorn Helgaas <helgaas@...nel.org>,
        Ding Tianhong <dingtianhong@...wei.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Michael Werner <werner@...lsio.com>,
        Ganesh GR <ganeshgr@...lsio.com>,
        "asit.k.mallick@...el.com" <asit.k.mallick@...el.com>,
        "patrick.j.cramer@...el.com" <patrick.j.cramer@...el.com>,
        "Suravee.Suthikulpanit@....com" <Suravee.Suthikulpanit@....com>,
        "Bob.Shaw@....com" <Bob.Shaw@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "amira@...lanox.com" <amira@...lanox.com>,
        "gabriele.paoloni@...wei.com" <gabriele.paoloni@...wei.com>,
        "David.Laight@...lab.com" <David.Laight@...lab.com>,
        "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "alexander.duyck@...il.com" <alexander.duyck@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>
Subject: Re: [PATCH v9 1/4] PCI: Add new PCIe Fabric End Node flag,
 PCI_DEV_FLAGS_NO_RELAXED_ORDERING

| From: Raj, Ashok <ashok.raj@...el.com>
| Sent: Wednesday, August 9, 2017 11:00 AM
|
| On Wed, Aug 09, 2017 at 04:46:07PM +0000, Casey Leedom wrote:
| > | From: Raj, Ashok <ashok.raj@...el.com>
| > | Sent: Wednesday, August 9, 2017 8:58 AM
| > | ...
| > | As Casey pointed out in an earlier thread, we choose the heavy hammer
| > | approach because there are some that can lead to data-corruption as
| > | opposed to perf degradation.
| >
| > Careful.  As far as I'm aware, there is no Data Corruption problem
| > whatsoever with Intel Root Ports and processing of Transaction Layer
| > Packets with and without the Relaxed Ordering Attribute set.
|
| That's right.. no data-corruption on Intel parts :-).. It was with other
| vendor. Only performance issue with intel root-ports in the parts identified
| by the optimization guide.

Yes, I didn't want you to get into any trouble over that possible reading of
what you wrote.

Any progress on the "Chicken Bit" investigation?  Being able to disable the
non-optimal Relaxed Ordering "optimization" would be the best PCI Quirk of
all ...

Casey