From: Borislav Petkov <bp@alien8.de>
To: Ashish Kalra <ashish.kalra@amd.com>
Cc: Thomas.Lendacky@amd.com, Jon.Grimm@amd.com,
brijesh.singh@amd.com, dave.hansen@linux-intel.com,
konrad.wilk@oracle.com, peterz@infradead.org, x86@kernel.org,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
mingo@redhat.com, luto@kernel.org, hpa@zytor.com,
rientjes@google.com, tglx@linutronix.de, hch@lst.de
Subject: Re: [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests.
Date: Mon, 7 Dec 2020 23:14:33 +0100 [thread overview]
Message-ID: <20201207221433.GI20489@zn.tnic> (raw)
In-Reply-To: <20201207220624.GB6855@ashkalra_ubuntu_server>
On Mon, Dec 07, 2020 at 10:06:24PM +0000, Ashish Kalra wrote:
> This is related to the earlier static adjustment of the SWIOTLB buffers
> as per guest memory size and Konrad's feedback on the same, as copied
> below :
>
> >>That is eating 128MB for 1GB, aka 12% of the guest memory allocated statically for this.
> >>
> >> And for guests that are 2GB, that is 12% until it gets to 3GB when
> >> it is 8% and then 6% at 4GB.
> >>
> >> I would prefer this to be based on your memory count, that is 6% of
> >> total memory.
So no rule of thumb and no measurements? Just a magic number 6.
Btw, pls trim the rest of the mail when you reply. Like I just did.
There's no need to leave text which you're not responding to, quoted.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
_______________________________________________
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iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Ashish Kalra <ashish.kalra@amd.com>
Cc: konrad.wilk@oracle.com, hch@lst.de, tglx@linutronix.de,
mingo@redhat.com, hpa@zytor.com, x86@kernel.org, luto@kernel.org,
peterz@infradead.org, dave.hansen@linux-intel.com,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
brijesh.singh@amd.com, Thomas.Lendacky@amd.com,
Jon.Grimm@amd.com, rientjes@google.com
Subject: Re: [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests.
Date: Mon, 7 Dec 2020 23:14:33 +0100 [thread overview]
Message-ID: <20201207221433.GI20489@zn.tnic> (raw)
In-Reply-To: <20201207220624.GB6855@ashkalra_ubuntu_server>
On Mon, Dec 07, 2020 at 10:06:24PM +0000, Ashish Kalra wrote:
> This is related to the earlier static adjustment of the SWIOTLB buffers
> as per guest memory size and Konrad's feedback on the same, as copied
> below :
>
> >>That is eating 128MB for 1GB, aka 12% of the guest memory allocated statically for this.
> >>
> >> And for guests that are 2GB, that is 12% until it gets to 3GB when
> >> it is 8% and then 6% at 4GB.
> >>
> >> I would prefer this to be based on your memory count, that is 6% of
> >> total memory.
So no rule of thumb and no measurements? Just a magic number 6.
Btw, pls trim the rest of the mail when you reply. Like I just did.
There's no need to leave text which you're not responding to, quoted.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-12-07 22:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 3:25 [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests Ashish Kalra
2020-12-03 3:25 ` Ashish Kalra
2020-12-07 12:10 ` Borislav Petkov
2020-12-07 12:10 ` Borislav Petkov
2020-12-07 22:06 ` Ashish Kalra
2020-12-07 22:06 ` Ashish Kalra
2020-12-07 22:14 ` Borislav Petkov [this message]
2020-12-07 22:14 ` Borislav Petkov
2020-12-07 22:20 ` Kalra, Ashish
2020-12-07 22:20 ` Kalra, Ashish
2020-12-07 22:33 ` Borislav Petkov
2020-12-07 22:33 ` Borislav Petkov
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