linux-kernel - Re: DMA error when sg->offset value is greater than PAGE

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Message-ID: <20170928130549.GA99456@otc-nc-03>
Date:   Thu, 28 Sep 2017 06:05:50 -0700
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Harsh Jain <Harsh@...lsio.com>
Cc:     Casey Leedom <leedom@...lsio.com>,
        Robin Murphy <robin.murphy@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        Michael Werner <werner@...lsio.com>, "nd@....com" <nd@....com>
Subject: Re: DMA error when sg->offset value is greater than PAGE_SIZE in
 Intel IOMMU

Thanks for trying that Harsh. 

sp_off turns of super page support. Which this mode, do you still see offsets greater than 4k?

On Thu, Sep 28, 2017 at 07:08:21PM +0530, Harsh Jain wrote:
> 
> 
> Today I tried with "Intel_iommu=sp_off" boot option. Traffic runs without any error for more than 1 hrs. What magic this option did? :)

Cheers,
Ashok