Date: Wed, 17 Sep 2025 08:10:49 +0200 From: Corvin =?ISO-8859-1?Q?K=F6hne?= <corvink@FreeBSD.org> To: Jonathan Vasquez <jon@xyinn.org>, "virtualization@freebsd.org" <virtualization@freebsd.org> Subject: Re: GPU Passthrough on FreeBSD 14.3 (AMD Radeon RX 6900 XT and Windows 10 Pro) Message-ID: <d776efc6caa4655932c5826a5254726b54f0922e.camel@FreeBSD.org> In-Reply-To: <HQJQz0Hozvec21gKyTxzLVEzEtV-bgFo-_bznYjO5YCz-lcTXzmXextt-EoWDx7MgOtkgbj1W0mlfMiOpFkblnHtj4shaRNC-aBACusnasY=@xyinn.org> References: =?us-ascii?Q?<6CV-OY6BcErrWRit9jSpi6fWsYBG3E=5FZ3u6eTLPcz6foPAZV1gQpZYaZTR7JA=5F1ot5RQVqrWQaLxJFySXjspIhSbBJGxmckcDQyzxhALNus=3D@xyinn.org> _<obPmbtHAn7PsdPlHCvUijyGOcJYzN8G0-VWTOzZnDzOnPAZcy5PNe6hU3JUSjuKcWWfpt8HzTQI47DdMymQP89JKuTIEd7uMHZf2xx=5FmtcM=3D@xyinn.org> _<8e7f6904-8188-4941-827b-c874d5da586d@Duedinghausen.eu> _<qL4a3FqFmcZXpCOOozFH1j4h344deHkH5YBeVAcnZFvGDJI-i6ogV50uZ-xQioPf1C9MBu-ShQLHJnT-BWFgEOr27F8hNq3MmkuiWyDu0xY=3D@xyinn.org> _<GXXvtGkj6StE4BIkkGS7gd01j9K7K3IIGkBOHHqgomnZuNxo-5Sz4WjNKV6HYi5HhPXeBIwsdkAuR71i7hJ8QEPaH4bqkhrTIaA2ti0IXoE=3D@xyinn.org> _<MN2PR20MB3168842FD4AAADEB8A29DC5DFE3EA@MN2PR20MB3168.namprd20.prod.outlook.com> _<fb59ninGeo2cCSN7tULNr1ZaXzLFaZn1Lh=5FSuGWMBCv63RAbqgZetMhn63dppXM7quUBuGF8U9N8-furgb-088Gn-LHr9-e9JYUPvHIvuqU=3D@xyinn.org> _<FIR4iioBciiFZPGzeCeKoY=5FRKIdxeWWraK2Dr98ag7G7X6n2u5CWtBc2GT7CAzc9sq9JUREXfr7tbj9Bpd341cp7YxJFyM04FczcztnSb=5FI=3D@xyinn.org> _<09-JQGKdIKMMp4u22KT=5FU=5Fn7lXzFRKrK3mODyLvhee7a7pYyagqdi1mbgVTeq5QIe=5FZrbGfkM4I03ocsBCj6ogh0?= =?us-ascii?Q?4hKyCcDdY65EtlrysuI=3D@xyinn.org> _<mCYFvsvCiJxYxJBB5ZoCDpZvD1K9kurQRfAA7xyg5YykjoH-NoSqP=5Fan0mexDVQ07wj1JOulA9imS1ss-zf4RSGSo4OMluxlovFwe7C5Y8c=3D@xyinn.org> ?= <HQJQz0Hozvec21gKyTxzLVEzEtV-bgFo-_bznYjO5YCz-lcTXzmXextt-EoWDx7MgOtkgbj1W0mlfMiOpFkblnHtj4shaRNC-aBACusnasY=@xyinn.org>
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--=-6fe20mZuoe/Gc5iqKEK+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-09-16 at 20:29 +0000, Jonathan Vasquez wrote: > I'm not familiar with Resize BAR, but my BIOS mentioned that it's to allo= w you > "take full advantage of the GPUs memory", I'm guessing that there may be = a > significant performance drop due to this being disabled, but the performa= nce > is already pretty good. Hi Jonathan, It highly depends on your workload. As you can see in your pciconf output, = the GPU memory is smaller without Resizable BAR support. So, on memory bound workloads you may see a difference. Compute bound workloads shouldn't expec= t a performance drop. --=20 Kind regards, Corvin --=-6fe20mZuoe/Gc5iqKEK+ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEgvRSla3m2t/H2U9G2FTaVjFeAmoFAmjKUOkACgkQ2FTaVjFe AmoqTA//bCdoUH+JsvuznzccWrTYtabOJrKlxQTkwor5g7k0cBHqwh7ObAoEA3QD ptp12xy9iTTd4Y5x/oHkAkEFedr6ZMR5IYidgadeGalUxdHOSGwiSL/DoZVFFWCC fVk6xZ99cRH8iZVcNxiiUUjn3s0yLyYdKJMlcPYNybkwvoeIS3P3GEFc3p8rcoq+ +YSpVD6pv3VOHkJciSb4f9NrQgSCEE+dmEck/PHFVMz+nvmT2l7MjDJkMSLwAYYs +ok5FdcJFS6aP5EQInpr8yvv7/u7sn93CqRYn5k/P5r/tFlY/ZAG7FdFBo8e0aq/ CIMbKKP7wQXp8VRYHGMC40EYBu2fECgnd5C4p9rWESXK51H7yl/dO9p33DgGbnGZ Ho6Cyu4bvtOvvFt+HZTr2PbuDgZaKJ47JZx9ZafM0FE1yleJjnCviowORXH6dIq6 zwNmQZVAAjx6RDZf+cV4NhV6/Osc0bsZgXwVh+beu7u9Ax7i9LT7ocPm+W2+bxZE 4Y2lYpkqpmNlXJLzSObGpFYlatUErwk3aFykATTt0J1wZ8Cjt6x+8/9x5NCLumSX MPDBLhgMU4vjG+tsQX90ULNrY4/4Dl1gnxMlDOEOso4biGLherRwfyryvY/FsM64 xAQTE/hRPWAKTdA8Fdf3r7eqPp+WypvtImLzLVwO1Ttcg7MGXG0= =rqY4 -----END PGP SIGNATURE----- --=-6fe20mZuoe/Gc5iqKEK+--
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