FUJITA Tomonori wrote: > On Tue, 22 Jan 2008 14:33:13 +0300 > Vladislav Bolkhovitin <[EMAIL PROTECTED]> wrote: > > >>FUJITA Tomonori wrote: >> >>>The big problem of stgt iSER is disk I/Os (move data between disk and >>>page cache). We need a proper asynchronous I/O mechanism, however, >>>Linux doesn't provide such and we use a workaround, which incurs large >>>latency. I guess, we cannot solve this until syslets is merged into >>>mainline. >> >>Hmm, SCST also doesn't have ability to use asynchronous I/O, but that >>doesn't prevent it from showing good performance. > > > I don't know how SCST performs I/Os, but surely, in kernel space, you > can performs I/Os asynchronously.
Sure, but currently it all synchronous > Or you use an event notification > mechanism with multiple kernel threads performing I/Os synchronously. > > Xen blktap has the same problem as stgt. IIRC, Xen mainline uses a > kernel patch to add a proper event notification to AIO though redhat > uses the same workaround as stgt instead of applying the kernel patch. > - > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > _______________________________________________ Stgt-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/stgt-devel
