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Date: Wed, 30 May 2007 14:58:03 +0200 From: Willy Tarreau <w@....eu> To: David Schwartz <davids@...master.com> Cc: Tejun Heo <htejun@...il.com>, linux-kernel@...r.kernel.org Subject: Re: epoll,threading On Wed, May 30, 2007 at 01:07:08AM -0700, David Schwartz wrote: > > > In my experience, it's not much the context switch by itself which causes > > performance degradation, but the fact that with threads, you have to put > > mutexes everywhere. And frankly, walking a list with locks everywhere > > is quite slower than doing it in one run at a rate of 3 or 4 cycles per > > entry. Also, local storage in function returns is not possible anymore, > > and some functions even need to malloc() instead of returning statically > > allocated data. I believe this is the reason for openssl being twice as > > slow when compiled thread-safe than in native mode. > > I don't know where you got this idea from, but several experiments of mine > failed to confirm it. Here, for example, are two identical builds of > OpenSSL, one with 'threads' and one with 'no-threads'. Same compiler, same > other flags, same hardware (Linux 2.6.21.2, P3-1Ghz): I can see that your numbers are equal in both cases. You have openssl 0.9.8d, and doing functions benchmarks. I observed this on openssl 0.9.6 + apache 1.3 + mod_ssl. The difference in terms of hits/s was 1 to 2, just with -DREENTRANT. Most probably some water has flowed under the bridges since... Anyway, that makes 0.9.8 interesting to look at ;-) Willy > > OpenSSL 0.9.8d 28 Sep 2006 > built on: Wed May 30 00:55:25 PDT 2007 > options:bn(64,32) md2(int) rc4(idx,int) des(ptr,risc1,16,long) aes(partial) > idea(int) blowfish(idx) > compiler: > gcc -DDSO_DLFCN -DHAVE_DLFCN_H -mcpu=pentium -DL_ENDIAN -DTERMIO -O3 -fomit- > frame-pointer -Wall -DOPENSSL_BN_ASM_PART_WORDS -DOPENSSL_IA32_SSE2 -DSHA1_A > SM -DMD5_ASM -DRMD160_ASM -DAES_ASM > available timing options: TIMES TIMEB HZ=100 [sysconf value] > timing function used: times > The 'numbers' are in 1000s of bytes per second processed. > type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 > bytes > md5 5295.13k 18837.99k 56614.66k 113037.65k > 157575.85k > des cbc 21280.46k 22224.36k 22536.87k 22626.65k > 22686.38k > sign verify sign/s verify/s > rsa 1024 bits 0.007653s 0.000381s 130.7 2626.1 > > OpenSSL 0.9.8d 28 Sep 2006 > built on: Wed May 30 00:55:23 PDT 2007 > options:bn(64,32) md2(int) rc4(idx,int) des(ptr,risc1,16,long) aes(partial) > idea(int) blowfish(idx) > compiler: > gcc -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -mcpu=pentium > -DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall -DOPENSSL_BN_ASM_PART_WOR > DS -DOPENSSL_IA32_SSE2 -DSHA1_ASM -DMD5_ASM -DRMD160_ASM -DAES_ASM > available timing options: TIMES TIMEB HZ=100 [sysconf value] > timing function used: times > The 'numbers' are in 1000s of bytes per second processed. > type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 > bytes > md5 5355.29k 18880.64k 56515.93k 113145.51k > 157908.99k > des cbc 21361.71k 22185.28k 22494.72k 22654.29k > 22659.07k > sign verify sign/s verify/s > rsa 1024 bits 0.007612s 0.000380s 131.4 2629.5 > > DS > - 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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