----- Original Message ----- From: "Neil Brown" <neilb@xxxxxxx> To: "JaniD++" <djani22@xxxxxxxxxxxxx> Cc: <linux-raid@xxxxxxxxxxxxxxx> Sent: Thursday, December 22, 2005 5:49 AM Subject: Re: RAID0 performance question > On Tuesday November 22, djani22@xxxxxxxxxxxxx wrote: > > I have already try the all available options, including readahead in all > > layer (result in earlyer mails), and chunksize. > > But with this settings, i cannot workaround this. > > And the result is incomprehensible for me! > > The raid0 performance is not equal with one component , with sum of all > > component , and not equal with the slowest component! > > This is quite perplexing. > > My next step would probably be to watch the network traffic with > tcpdump or ethereal. I would look for any differences between when it > is going quickly (without raid0) and when slowly (with raid0). > > Rather than tcpdump, it might be easier to instrument the nbd server > to print out requests and timestamps. Yes, it is good idea! I will try it, thanks! > > Sorry I cannot be more helpful, and do have a Merry Christmas anyway > :-) The same to you, and everybody on this list! :-) Cheers, Janos > > NeilBrown > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
