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Date: Mon, 21 Mar 2011 12:25:05 +0000 From: Steve Allen <Steve.Allen@...lsupplychain.com> To: "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org> Subject: 2.6.37 kernel poor sg(x) driver scsi hard drive performence Hello, My first post, apologies if asking the wrong question in the wrong place. E= ndeavoured to be correct, read FAQ & searched mailing lists. I have a specific use of linux as a scsi hard drive test environment. I hav= e been using knoppix with kernel 2.6.28.4 for a number of years very sucess= fuly. I test 14 drives simultaneously in an external drive bay using for example = scsi write-same erase command. Although we use a product from santools, sma= rtmon-ux, sg_write_same is available form scsitools etc. I have updated to knoppix 6.4.4 with kernel 2.6.37 and cannot test in the s= ame manner, the performance makes the test operation impractical. Although, I can test one drive at a time under 2.6.37 with the same test t= ime as 2.6.28.4, as soon as I load additional drives the test times sore = from 18m to 134m. I have tried googling and come across I/O throttling. Am I on the right lin= es? I have attempted to research cgroups but the info is mainly on limiting thr= oughput. Any ideas would be appreciated, happy to run any tests etc. Many reasons why I would like to keep 2.6.37 Regards, SteveA -- 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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