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From: Mike Christie <>
Subject: [RFC PATCH 0/4] scsi/iscsi: Send iscsi data from kblockd
Date: Mon,  7 Mar 2022 18:39:53 -0600	[thread overview]
Message-ID: <> (raw)

The following patches allow iscsi to transmit the initial iscsi PDU and
data from the kblockd context similar to how nvme/tcp does it. This has
the benefit that in a lot of our setups, we run
number_of_sessions == CPUs, so the apps performing IO share the CPU with
the iscsi layer. Right now, a lot of times we end up going from kblockd
to the iscsi workqueue which just adds an extra hop. By running from the
kblockd workqueue we see improvements of 20-30% in IOPs and throughput.

I made this a RFC and cc'd Ming and Bart because I wanted to get some
extra feed back on the first patch:

scsi: Allow drivers to set BLK_MQ_F_BLOCKING

because you guys know that code. For example the iscsi layer doesn't use
scsi_host_block so we won't run into problems there. But I wanted to make
sure there were not other possible issues.

The following patches were made over this iscsi patchset

the scsi patch applies over Linus or Martin's tree.

             reply	other threads:[~2022-03-08  0:40 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-08  0:39 Mike Christie [this message]
2022-03-08  0:39 ` [RFC PATCH 1/4] scsi: Allow drivers to set BLK_MQ_F_BLOCKING Mike Christie
2022-03-08  4:57   ` Bart Van Assche
2022-03-09  0:53   ` Ming Lei
2022-03-09  1:17     ` Mike Christie
2022-03-09  1:43       ` Ming Lei
2022-03-09 19:38         ` Mike Christie
2022-03-08  0:39 ` [RFC PATCH 2/4] scsi: iscsi: Tell drivers when we must not block Mike Christie
2022-03-08  4:59   ` Bart Van Assche
2022-03-08 15:58     ` Mike Christie
2022-03-08  0:39 ` [RFC PATCH 3/4] scsi: iscsi: Support transmit from queuecommand Mike Christie
2022-03-08  0:39 ` [RFC PATCH 4/4] scsi: iscsi_tcp: Allow user to control if " Mike Christie
2022-03-08  5:10   ` Bart Van Assche
2022-03-08 16:51     ` Mike Christie
     [not found] ` <CGME20220308004023epcas2p12ebd497c14d32f36d0aa6682c0b9d0db@epcms2p7>
2022-03-08  7:00   ` [RFC PATCH 1/4] scsi: Allow drivers to set BLK_MQ_F_BLOCKING Daejun Park
2022-03-08 16:14     ` Mike Christie
2022-03-15  8:26 ` [RFC PATCH 0/4] scsi/iscsi: Send iscsi data from kblockd Christoph Hellwig
2022-03-16  1:08   ` Ming Lei

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