Re: [CentOS] new ssd to play with
From: Jerry Geis ge...@pagestation.com I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec Intel 5 Series/3400 Series Chipset 6 port SATA AHCI Controller 64GB Crucial 2.5 RealSSD C300 rev 7 (udma5) # hdparm -t /dev/sda Timing buffered disk reads: 636 MB in 3.01 seconds = 211.58 MB/sec # hdparm -T /dev/sda Timing cached reads: 18016 MB in 2.00 seconds = 9023.48 MB/sec JD ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On 09/07/2011 10:55 PM, Jerry Geis wrote: I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec Not sure about Centos 6 but I just got a new System with a Crucial M4 128G disk and and the difference to my previous non-ssd system is *huge*: /dev/sda: Timing buffered disk reads: 700 MB in 3.00 seconds = 233.11 MB/sec And that's just the throughput. What really is amazing is the reduced latency which makes the desktop fly. 100mb/s sound really broken though. Even the slowest ssd drives should give you more than that. Try installing Fedora 15 (what I'm using right now) and if you see the same performance then it might be a hardware problem. If the performance is much better under Fedora 15 though then there might be an issue with Centos 6 and ssd's (though I'm not sure what that could be in a simple read-only benchmark). Regards, Dennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On 09/08/2011 03:28 PM, Dennis Jacobfeuerborn wrote: On 09/07/2011 10:55 PM, Jerry Geis wrote: I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec Not sure about Centos 6 but I just got a new System with a Crucial M4 128G disk and and the difference to my previous non-ssd system is *huge*: /dev/sda: Timing buffered disk reads: 700 MB in 3.00 seconds = 233.11 MB/sec And that's just the throughput. What really is amazing is the reduced latency which makes the desktop fly. 100mb/s sound really broken though. Even the slowest ssd drives should give you more than that. Try installing Fedora 15 (what I'm using right now) and if you see the same performance then it might be a hardware problem. If the performance is much better under Fedora 15 though then there might be an issue with Centos 6 and ssd's (though I'm not sure what that could be in a simple read-only benchmark). This just occured to me: are you maybe cpu bound? Since you use an atom based system maybe your system simply cannot deliver the full performance of the drive? Regards, Dennis ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On 09/07/2011 09:55 PM, Jerry Geis wrote: I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. I'm going to guess, off the top of my head, based on my experience, that your atom cant process the data fast enough and your benchmark isnt really worthwhile. get a copy of iozone setup on the box, and get it to run through a few iterations with the 5400rpm disk and then the SSD. I have an i5 @2.4Ghz per core, and it struggles to keep up with the sata2 interface ( with a Crucial M4 on the other side ). I suspect I can go faster with a sata3 interface.. Some of my initial observations: http://www.karan.org/blog/index.php/2011/08/29/a-few-notes-on-ssds-in-laptops - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On 09/08/2011 02:05 PM, John Doe wrote: # hdparm -t /dev/sda Timing buffered disk reads: 636 MB in 3.01 seconds = 211.58 MB/sec # hdparm -T /dev/sda Timing cached reads: 18016 MB in 2.00 seconds = 9023.48 MB/sec I'm not a big fan of using hdparm for real benchmarking or comparing things but for the sake of completeness. /dev/sde: Timing cached reads: 24004 MB in 2.00 seconds = 12025.18 MB/sec Timing buffered disk reads: 982 MB in 3.00 seconds = 326.98 MB/sec This is on a dual: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz with 05:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02) - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
From: Karanbir Singh mail-li...@karan.org get a copy of iozone setup on the box, and get it to run through a few iterations with the 5400rpm disk and then the SSD. FYI, here's an iozone of my SSD (some numbers look a bit strange)... Dunno if I used correct parameters... Auto Mode Command line used: iozone -a -f /TMP/io.dat -U /TMP Output is in Kbytes/sec Time Resolution = 0.01 seconds. Processor cache size set to 1024 Kbytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 64 4 438043 516414 149896 153146 26434 1143223 15571 901377 139751 541412 503814 85548 91310 64 8 460591 645579 139388 148159 30841 1049372 28920 1066042 152018 674790 1163036 104092 87786 64 16 538156 695778 188137 177207 61121 752329 51074 983980 129816 703068 1336792 76091 62560 64 32 524487 673098 2358717 2067979 123543 1599680 70496 901377 106487 877797 852702 119634 110886 64 64 592827 727850 2133730 2133730 117026 703068 110932 789967 128511 780776 752329 130574 114285 128 4 524387 684081 192164 185780 43053 1332828 17472 1142750 83225 659704 662962 146814 152010 128 8 589446 780556 206504 216584 46092 826202 28546 1142750 263455 809997 702889 121441 123794 128 16 633995 1243315 210141 175573 50354 805138 48745 1377278 261657 819893 853794 137349 123680 128 32 646983 962469 240124 226546 99608 1705404 88216 1455701 252906 881842 895074 135136 116995 128 64 650117 908709 2608629 2621367 164341 1663139 125736 971174 140659 978253 1015251 153312 151666 128 128 831319 1579934 2843510 2969325 156075 2004703 155173 992724 156485 921183 908709 15 158238 256 4 552675 695966 199810 218071 38594 838988 18451 1312954 86426 1058076 695966 173918 173890 256 8 1185399 876662 237721 219902 54480 897923 35261 1642294 126295 850282 817898 176549 176811 256 16 699594 1213534 240597 240382 81580 2034350 50814 1694118 575175 924200 891956 151576 149696 256 32 714967 962301 231469 216969 75229 2170027 80407 2533571 393195 980760 985259 140508 135371 256 64 831194 965763 305057 288267 156275 1098113 105695 1552085 248792 1049800 1049800 149010 159787 256 128 753077 987979 3169196 3159869 158116 1471270 147051 2849590 172383 1142514 1195962 169552 174399 256 256 750970 1057034 3123106 2726577 197968 1044693 177924 1108314 187559 1080434 1062263 184307 185229 512 4 577155 802555 244176 242658 50818 1605228 19018 1387437 78732 693003 711133 206274 205701 512 8 686358 929322 234753 234753 64777 1904125 34991 2560168 128863 867738 887461 211204 217316 512 16 727268 1015932 247468 251349 94850 1954379 57709 1992458 162333 920953 929322 209494 216114 512 32 756207 1759070 256360 261225 120443 2460437 96059 2089386 729244 980673 992456 214152 201342 512 64 804962 1049187 292739 296294 117138 2285029 115184 1992458 535024 1701913 1062161 207050 12 512 128 803757 1117430 395717 407275 170899 2207515 155526 1712772 382945 1547395 1096322 197527 199454 512 256 781811 1051242 467168 442889 202941 2370799 188312 1645826 354323 1233614 1383861 201891 192412 512 512 797489 1135150 3220553 3239989 195353 2169601 197983 2047551 202138 2091421 1910902 196389 201664 1024 4 1186518 797460 254610 255488 64169 769872 20444 1321200 92702 735086 721139 234751 239971 1024 8 694214 971534 250789 256710 87349 2011877 38694 1924436 124999 876737 865605 237700 236757 1024 16 1393200 1035229 264048 263046 106211 1040496 63245 2094282 170436 941299 952573 234111 233462 1024 32 789544 1090700 262227 270331 113828 2265510 87165 4064103 192981 1032492 987619 240995 226351 1024 64 979064 1139005 281087 275710 130531 2426801 114198 2381058 1192117 1057924 1057924 232087 235614 1024 128 1512415 1131503 326320 320500 155903 1177088 154986 2188177 653445 1089317 1092921 227755 225400 1024 256 810095 1127641 333103 331944 205995 2240689 191331 3556008 633307 1183902 1192117 231674 230011 1024 512 799241
[CentOS] new ssd to play with
I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec The Samsung 5400 RPM disk (in the zotac running Centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 196 MB in 3.01 seconds = 65.02 MB/sec I'm not supper impressed at all. Sure the numbers say its slightly better but I don't feel it. I was expecting like really noticeable change in application load time or something - but not really. Just wondering... Is there something that has to be done to take advantage of the SSD performance? Thanks, jerry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On Wed, 7 Sep 2011, Jerry Geis wrote: I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec The Samsung 5400 RPM disk (in the zotac running Centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 196 MB in 3.01 seconds = 65.02 MB/sec I'm not supper impressed at all. Sure the numbers say its slightly better but I don't feel it. I was expecting like really noticeable change in application load time or something - but not really. Just wondering... Is there something that has to be done to take advantage of the SSD performance? You need to verify that AHCI is enabled for the sata interface. -Connie Sieh Thanks, jerry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
Jerry Geis wrote: I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. http://hardware.slashdot.org/story/11/09/06/2317211/Costly-SSDs-Worth-It-Users-Say says that it depends on how you use it. mark ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On Wed, Sep 7, 2011 at 3:55 PM, Jerry Geis ge...@pagestation.com wrote: I grabbed a new SSD M4-CT064M4SSD2 from Crucial. I am disappointed. I stuck the unit in an Atom machine (zotac) with CentOS 6 on the disk. It really doesn't feel faster than the previous 5400 RPM drive that was in it. The SSD is giving me (in the zotac running centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec The Samsung 5400 RPM disk (in the zotac running Centos 6): hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 196 MB in 3.01 seconds = 65.02 MB/sec I'm not supper impressed at all. Sure the numbers say its slightly better but I don't feel it. I was expecting like really noticeable change in application load time or something - but not really. Just wondering... Is there something that has to be done to take advantage of the SSD performance? The point of an SSD isn't the transfer time when reading sequentially ordered sectors, it is that you don't have to wait 8msec/track every time the head has to move and wait for the disk to spin around to the sector you want when that doesn't immediately follow the last one. The OS makes a great effort to cache everything and avoid the delays so you may not notice a big difference except the first time you load something new. -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] new ssd to play with
On Wed, 7 Sep 2011, Jerry Geis wrote: Just wondering... Is there something that has to be done to take advantage of the SSD performance? I'll note that CentOS 6 and my SSDs haven't (yet) worked and played well together. Debian 6, otoh, screams... I'm semi-sure my CentOS/SSD issues are pilot error, but I haven't had time to troubleshoot. -- Paul Heinlein heinl...@madboa.com http://www.madboa.com/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
