linux-kernel - Re: [PATCH v2] scsi: pm8001: Increase request sg length to support 4MiB requests

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Message-ID: <yq1plnd88ut.fsf@ca-mkp.ca.oracle.com>
Date: Sat, 02 Nov 2024 20:22:24 -0400
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: Igor Pylypiv <ipylypiv@...gle.com>
Cc: Jack Wang <jinpu.wang@...ud.ionos.com>,
        "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>,
        "Martin K. Petersen"
 <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: pm8001: Increase request sg length to support
 4MiB requests


Igor,

> Increasing the per-request size maximum to 4MiB (8192 sectors x 512
> bytes) runs into the per-device DMA scatter gather list limit
> (max_segments) for users of the io vector system calls (e.g. readv and
> writev).
>
> This change increases the max scatter gather list length to 1024 to
> enable kernel to send 4MiB (1024 * 4KiB page size) requests.

Applied to 6.13/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering