On 01/11/2017 05:26 PM, Bart Van Assche wrote: > On Wed, 2017-01-11 at 17:22 +0100, Hannes Reinecke wrote: >> On 01/11/2017 05:12 PM, hch@xxxxxxxxxxxxx wrote: >>> On Wed, Jan 11, 2017 at 04:08:31PM +0000, Bart Van Assche wrote: >>>> 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. > > Hello Hannes, > > The first e-mail in this e-mail thread referred to measurements against a > block device for which interrupt coalescing was not enabled. I think that > the measurements have to be repeated against a block device for which > interrupt coalescing is enabled. > Guess what we'll be doing in the next few days ... Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
