From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: James Smart <jsmart2021@gmail.com>
Cc: linux-scsi@vger.kernel.org, Dick Kennedy <dick.kennedy@broadcom.com>
Subject: Re: [PATCH v3] lpfc: Mitigate high memory pre-allocation by SCSI-MQ
Date: Mon, 19 Aug 2019 22:15:23 -0400 [thread overview]
Message-ID: <yq14l2czio4.fsf@oracle.com> (raw)
In-Reply-To: <20190816023649.16682-1-jsmart2021@gmail.com> (James Smart's message of "Thu, 15 Aug 2019 19:36:49 -0700")
James,
> When SCSI-MQ is enabled, the SCSI-MQ layers will do pre-allocation of
> MQ resources based on shost values set by the driver. In newer cases
> of the driver, which attempts to set nr_hw_queues to the cpu count,
> the multipliers become excessive, with a single shost having SCSI-MQ
> pre-allocation reaching into the multiple GBytes range. NPIV, which
> creates additional shosts, only multiply this overhead. On lower-memory
> systems, this can exhaust system memory very quickly, resulting in a
> system crash or failures in the driver or elsewhere due to low memory
> conditions.
Applied to 5.3/scsi-fixes. Thanks!
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2019-08-20 2:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 2:36 [PATCH v3] lpfc: Mitigate high memory pre-allocation by SCSI-MQ James Smart
2019-08-16 16:36 ` Ewan D. Milne
2019-08-20 2:15 ` Martin K. Petersen [this message]
2019-08-26 7:18 ` Hannes Reinecke
2019-08-26 16:23 ` James Smart
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