From: Christoph Hellwig <hch@infradead.org>
To: "Melanie Plageman (Microsoft)" <melanieplageman@gmail.com>
Cc: tyreld@linux.ibm.com, linux-hyperv@vger.kernel.org,
mst@redhat.com, jasowang@redhat.com, mikelley@microsoft.com,
R-QLogic-Storage-Upstream@marvell.com, paulus@samba.org,
kys@microsoft.com, wei.liu@kernel.org, sthemmin@microsoft.com,
linux-scsi@vger.kernel.org, sathya.prakash@broadcom.com,
decui@microsoft.com, kashyap.desai@broadcom.com,
njavali@marvell.com, MPT-FusionLinux.pdl@broadcom.com,
haiyangz@microsoft.com, mpi3mr-linuxdrv.pdl@broadcom.com,
suganath-prabu.subramani@broadcom.com, jejb@linux.ibm.com,
john.garry@huawei.com, stefanha@redhat.com,
storagedev@microchip.com,
virtualization@lists.linux-foundation.org,
megaraidlinux.pdl@broadcom.com, sreekanth.reddy@broadcom.com,
martin.petersen@oracle.com,
shivasharan.srikanteshwara@broadcom.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
sumit.saxena@broadcom.com, andres@anarazel.de,
pbonzini@redhat.com, don.brace@microchip.com
Subject: Re: [PATCH RFC v1 0/5] Add SCSI per device tagsets
Date: Fri, 18 Feb 2022 23:37:03 -0800 [thread overview]
Message-ID: <YhCeHweaO5ugY5aC@infradead.org> (raw)
In-Reply-To: <20220218184157.176457-1-melanieplageman@gmail.com>
On Fri, Feb 18, 2022 at 06:41:52PM +0000, Melanie Plageman (Microsoft) wrote:
> Currently a single blk_mq_tag_set is associated with a Scsi_Host. When SCSI
> controllers are limited, attaching multiple devices to the same controller is
> required. In cloud environments with relatively high latency persistent storage,
> requiring all devices on a controller to share a single blk_mq_tag_set
> negatively impacts performance.
So add more controllers instead of completely breaking the architecture.
next prev parent reply other threads:[~2022-02-19 7:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 18:41 [PATCH RFC v1 0/5] Add SCSI per device tagsets Melanie Plageman (Microsoft)
2022-02-18 18:41 ` [PATCH RFC v1 1/5] scsi: core: Rename host_tagset to hctx_share_tags Melanie Plageman (Microsoft)
2022-02-18 18:41 ` [PATCH RFC v1 2/5] scsi: map_queues() takes tag set instead of host Melanie Plageman (Microsoft)
2022-02-18 18:41 ` [PATCH RFC v1 3/5] scsi: core: Add per device tag sets Melanie Plageman (Microsoft)
2022-02-18 18:41 ` [PATCH RFC v1 4/5] scsi: storvsc: use " Melanie Plageman (Microsoft)
2022-02-18 18:41 ` [PATCH RFC v1 5/5] scsi: storvsc: Hardware queues share blk_mq_tags Melanie Plageman (Microsoft)
2022-02-19 7:37 ` Christoph Hellwig [this message]
2022-02-21 17:40 ` [PATCH RFC v1 0/5] Add SCSI per device tagsets John Garry
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