Re: [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers
From: Hannes Reinecke <hare@suse.de>
Date: 2017-01-11 16:22:35
Also in:
linux-nvme, linux-scsi
On 01/11/2017 05:12 PM, hch@infradead.org wrote:
On Wed, Jan 11, 2017 at 04:08:31PM +0000, Bart Van Assche wrote:quoted
A typical Ethernet network adapter delays the generation of an interrupt after it has received a packet. A typical block device or HBA does not delay the generation of an interrupt that reports an I/O completion.NVMe allows for configurable interrupt coalescing, as do a few modern SCSI HBAs.
Essentially every modern SCSI HBA does interrupt coalescing; otherwise the queuing interface won't work efficiently. Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N�rnberg GF: F. Imend�rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N�rnberg)