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

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Message-ID: <MWHPR12MB1600471F60D862E5788B8439C88B0@MWHPR12MB1600.namprd12.prod.outlook.com>
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>,
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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