tag:blogger.com,1999:blog-3014099941823379560.post8740833087246225134..comments2023-02-18T10:46:34.161-06:00Comments on Jeff Bastian's Blog: Storage Speed on the PandaBoardJeff Bastianhttp://www.blogger.com/profile/18128075341421142000noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-3014099941823379560.post-73794998735754043772011-06-12T03:41:43.873-05:002011-06-12T03:41:43.873-05:00I saw that post yeah, pretty interesting. I wonder...I saw that post yeah, pretty interesting. I wonder if it also improves SD storage speed, did you notice anything?<br /><br />I'd do it myself but the USB HDD of my Pandaboard seems to have died yesterday so I have to find a new storage solution. :-(<br /><br />Some reading yesterday did remind me that I have to fix partition alignment on the SDs or the speed will just be horrible.Wilmer van der Gaasthttps://www.blogger.com/profile/14588872074963049785noreply@blogger.comtag:blogger.com,1999:blog-3014099941823379560.post-9025031136199378322011-06-11T10:06:36.007-05:002011-06-11T10:06:36.007-05:00I think the long latency times are due to a bug wi...I think the long latency times are due to a bug with the smsc95xx driver, or possibly with the hardware itself. If you look at the numbers from my newer post ("Storage Speed on the PandaBoard Revisited"), you'll see the seek time drops to 1.5 seconds when I'm running 'sudo ping -i 0.001 pandaboard' from another system. Also, the seeks/second increases to 162. One theory that I read was that the chip may be queueing up requests and dealing with them in one burst, possibly to save power.Jeff Bastianhttps://www.blogger.com/profile/18128075341421142000noreply@blogger.comtag:blogger.com,1999:blog-3014099941823379560.post-36203054543647938662011-06-11T08:04:42.746-05:002011-06-11T08:04:42.746-05:00Great analysis, thanks. I've looked at this to...Great analysis, thanks. I've looked at this too since I also find the PandaBoard unbearably sluggish on SD (I use a USB MicroDrive as my rootfs and just use SD for /boot).<br /><br />What confuses me about these numbers is that the seek latency for your USB HDD is much higher (but 7.6sec.. for what?) than for the SD card, yet the USB HD can do almost 100 of them per second, and the SD card only 27?<br /><br />I wonder what's behind these numbers. I have a strong feeling that the slowness of the PandaBoard SD can't be fully expressed in benchmark numbers (other than the number of hours an apt-get dist-upgrade takes.. :-/). I wish they'd fix it. I bought a 32GB SD card for this thing, but what's the point..Wilmer van der Gaasthttps://www.blogger.com/profile/14588872074963049785noreply@blogger.com