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Date: Thu, 10 Jul 2014 15:52:49 +0200 From: Jens Axboe <axboe@...nel.dk> To: Christoph Hellwig <hch@...radead.org>, Benjamin LaHaise <bcrl@...ck.org> CC: "Elliott, Robert (Server Storage)" <Elliott@...com>, "dgilbert@...erlog.com" <dgilbert@...erlog.com>, James Bottomley <James.Bottomley@...senPartnership.com>, Bart Van Assche <bvanassche@...ionio.com>, "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: scsi-mq V2 On 2014-07-10 15:50, Christoph Hellwig wrote: > On Thu, Jul 10, 2014 at 09:36:09AM -0400, Benjamin LaHaise wrote: >> There is one possible concern that could be exacerbated by other changes in >> the system: if the application is running close to the bare minimum number >> of requests allocated in io_setup(), the per cpu reference counters will >> have a hard time batching things. It might be worth testing with an >> increased number of requests being allocated if this is the case. > > Well, Robert said reverting the two aio commits didn't help. Either he > didn't manage to boot into the right kernel, or we need to look > elsewhere for the culprit. Rob, let me know what scsi_debug setup you use, and I can try and reproduce it here as well. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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