Messages in this thread | | | Date | Sat, 5 Jan 2002 01:51:41 +0100 (MET) | From | Mikael Pettersson <> | Subject | 2.5.2-pre performance degradation on an old 486 |
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When running 2.5.2-pre7 on my old for-testing-only 486(*), file-system accesses seem to come in distinct bursts preceded by lengthy pauses. Overall performance is down quite significantly compared to 2.4.18pre1 and 2.2.20pre2. To measure it I ran two simple tests:
Test 1: time to boot the kernel, from hitting enter at the LILO prompt to getting a login prompt Test 2: time to "rm -rf" a clean linux-2.4.17 source tree, using the newly booted kernel (no other access to the tree before that, so it wasn't cached in any way, and the machine was otherwise idle)
Test 1 Test 2 2.2.21pre2: 71 sec 75 sec 2.4.18pre1: 64 sec 72 sec 2.5.2-pre7: 97 sec 251 sec
I haven't noticed any slowdowns on my other boxes, so I didn't do any measurements on them. On the 486 it's very very obvious.
/Mikael
(*) 100MHz 486DX4, 28MB ram, no L2 cache, two old and slow IDE disks, small custom no-nonsense RedHat 7.2, kernels compiled with gcc 2.95.3. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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