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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[-- Attachment #1 --] 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 allow 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 performance > 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 expect a performance drop. -- Kind regards, Corvin [-- Attachment #2 --] -----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-----help
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